Review Volume 123 | Issue 3 | March 2015
Environ Health Perspect; DOI:10.1289/ehp.1408292
Children’s Health in Latin America: The Influence of Environmental Exposures
Amalia Laborde,1 Fernando Tomasina,1 Fabrizio Bianchi,2 Marie-Noel Bruné,3 Irena Buka,4 Pietro Comba,5 Lilian Corra,6,7 Liliana Cori,2 Christin Maria Duffert,3 Raul Harari,8 Ivano Iavarone,5 Melissa A. McDiarmid,9 Kimberly A. Gray,10 Peter D. Sly,11 Agnes Soares,12 William A. Suk,10 and Philip J. Landrigan13,14
Background: Chronic diseases are increasing among children in Latin America.
Objective and Methods: To examine environmental risk factors for chronic disease in Latin American children and to develop a strategic initiative for control of these exposures, the World Health Organization (WHO) including the Pan American Health Organization (PAHO), the Collegium Ramazzini, and Latin American scientists reviewed regional and relevant global data.
Results: Industrial development and urbanization are proceeding rapidly in Latin America, and environmental pollution has become widespread. Environmental threats to children’s health include traditional hazards such as indoor air pollution and drinking-water contamination; the newer hazards of urban air pollution; toxic chemicals such as lead, asbestos, mercury, arsenic, and pesticides; hazardous and electronic waste; and climate change. The mix of traditional and modern hazards varies greatly across and within countries reflecting industrialization, urbanization, and socioeconomic forces.
Conclusions: To control environmental threats to children’s health in Latin America, WHO, including PAHO, will focus on the most highly prevalent and serious hazards—indoor and outdoor air pollution, water pollution, and toxic chemicals. Strategies for controlling these hazards include developing tracking data on regional trends in children’s environmental health (CEH), building a network of Collaborating Centres, promoting biomedical research in CEH, building regional capacity, supporting development of evidence-based prevention policies, studying the economic costs of chronic diseases in children, and developing platforms for dialogue with relevant stakeholders.
Citation: Laborde A, Tomasina F, Bianchi F, Bruné MN, Buka I, Comba P, Corra L, Cori L, Duffert CM, Harari R, Iavarone I, McDiarmid MA, Gray KA, Sly PD, Soares A, Suk WA, Landrigan PJ. 2015. Children’s health in Latin America: the influence of environmental exposures. Environ Health Perspect 123:201–209; http://dx.doi.org/10.1289/ehp.1408292
Address correspondence to P.J. Landrigan, Department of Preventive Medicine and Arnhold Global Health Institute, Icahn School of Medicine at Mount Sinai, 17 East 102nd St., New York, New York USA. Telephone: (212) 824-7018. E-mail: firstname.lastname@example.org
The authors alone are responsible for the views expressed in this article, which do not necessarily represent the views, decisions, or policies of the institutions with which the authors are affiliated. This article should not be reproduced for use in association with the promotion of commercial products, services, or any legal entity. The World Health Organization (WHO) does not endorse any specific organization or products. Any reproduction of this article cannot include the use of the WHO logo.
The authors declare they have no actual or potential competing financial interests.
Received: 18 February 2014
Accepted: 2 December 2014
Advance Publication: 5 December 2014
Final Publication: 1 March 2015
- Supplemental Material (207 KB) PDF
Physical, chemical, and biological hazards in the environment are responsible for > 24% of the global burden of disease and for 36% of all deaths in children worldwide (Prüss-Üstün and Corvalán 2006). The Pan American Health Organization (PAHO) estimates that nearly 100,000 children in the Americas < 5 years of age die each year from physical, chemical, and biological hazards in the environment (PAHO 2011). Hazardous environmental exposures in early life can produce disease in childhood and also influence health across the life span (Barker 2004).
The > 300 million children < 20 years of age who live in Latin America and the Caribbean (LAC) face a complex and rapidly changing array of environmental threats to health (PAHO 2011). These include the traditional hazards of indoor air pollution and contaminated drinking water (PAHO 2012a; WHO 2000). But additionally, children today are exposed to newer environmental threats such as urban air pollution, toxic synthetic chemicals, pesticides, heavy metals, unsustainable urban growth, hazardous wastes including electrical and electronic waste (e-waste), and global climate change [Barreto 2004; Barreto et al. 2012; PAHO 2012b; World Health Organization (WHO) and United Nations Environment Programme (UNEP) 2010].
The diseases caused by traditional environmental hazards are predominantly the ancient scourges of diarrhea and pneumonia plus a wide range of parasitic and other infectious diseases, especially malaria, dengue, and Chagas disease (Pronczuk et al. 2011). By contrast, modern environmental threats are linked mainly to chronic diseases: asthma, neurodevelopmental disorders, birth defects, obesity, diabetes, cardiovascular disease, mental health problems, and pediatric cancer (Haggerty and Rothman 1975; PAHO 2012b). This change in patterns of disease is termed the “epidemiological transition.” Countries passing through the epidemiological transition must deal simultaneously with epidemics of both infectious and chronic diseases.
The mix of environmental hazards and the diseases that they cause varies among countries in Latin America and even regionally within countries, depending on demographics, socioeconomic factors, urbanization, and degree of industrial development (Barreto 2004; De Maio 2011; PAHO 2007). Disparities in health status by race, ethnicity, and social class are powerful determinants of disease (PAHO 2011, 2012b). Some countries such as Argentina, Chile, and Uruguay have largely completed the epidemiological transition; some such as Brazil, Colombia, Costa Rica, Mexico, and Venezuela are passing through it now; and in others such as Ecuador and Guatemala the transition has been delayed, and infectious diseases are still the predominant causes of morbidity and mortality (Marinho et al. 2013).
Toxic chemicals are important causes of disease in Latin America. Many thousands of new chemicals and pesticides have been invented and spread into the environment over the past 50 years (Landrigan and Goldman 2011). Most did not previously exist in nature. Although not well publicized, this “chemical revolution” is one of the most important environmental changes that have transformed the developing world in the past half-century. Evidence of widespread exposure is provided by national surveys in industrially developed countries documenting measurable levels of > 100 synthetic chemicals in the bodies of virtually all persons (Centers for Disease Control and Prevention 2014). Children are exquisitely vulnerable to toxic chemicals [National Research Council (NRC) 1993; Prüss-Üstün and Corvalán 2006].
Urbanization is a powerful driving force in health and disease. Latin America is the most highly urbanized region of the world, with approximately 72% of the population living in urban centers [UN Habitat (United Nations Program for Human Settlement) 2012]. The fraction of the population residing in cities is rising steadily.
The climate of Latin America is also changing (Jenkins 1998; PAHO 2011). Deforestation is a major concern (PAHO 2012b). Climate change and deforestation can affect children’s health by leading to increased risk of floods, landslides, and extreme weather events and also by changing the distribution of insect vectors of disease (Patz et al. 1996).
To examine trends in pediatric disease and in the environment and to develop evidence-based strategies to improve child health and control environmental hazards, WHO developed a coordinated global program for research, education, and action in children’s environmental health (CEH) (Pronczuk et al. 2011; WHO and UNEP 2010). Formally launched in 2002 during the World Summit on Sustainable Development, the WHO CEH strategy aims to prevent disease and disability associated with chemical and physical threats to health. The WHO CEH program has evolved and developed through a series of conferences and consultations (see Supplemental Material, Appendix S1, “International and regional meetings on children’s environmental health convened by WHO”), and has achieved important successes (see Supplemental Material, Appendix S2, “Accomplishments of the WHO/PAHO program in children’s environmental health”). PAHO has led evolution of the CEH program in the Americas (PAHO 2011, 2012b).
In this review, we describe a plan for developing the WHO/PAHO strategic initiative in CEH in Latin America. Much of the material presented here was initially discussed in an International Scientific Conference: Environmental Health in the Political Agenda convened in Montevideo, Uruguay, on 22–24 March 2012. This conference honored the memory and life’s work of the late Uruguayan physician and global advocate for CEH, Jenny Pronczuk de Garbino. An editorial in this issue pays tribute to Dr. Pronczuk (Landrigan and Suk 2015).
Specific Environmental Health Threats to Children in Latin America
Indoor air pollution. Indoor air pollution is the leading environmental threat to health in the Americas, being responsible for nearly 5% of healthy years of life lost and 7% of premature deaths (WHO 2014c). WHO estimates that in 2012, 7,500 deaths were attributable to indoor air pollution in children < 5 years of age in low- and middle-income countries of the Americas (WHO 2014c). In 2010, indoor air pollution ranked eighth among risk factors for chronic disease in Latin America (Lim et al. 2012).
Solid and biomass fuels are the major source of indoor air pollution, especially in rural areas. WHO estimates that in 2010, 10% of the population of Latin America relied on solid and biomass fuels for cooking and heating, largely in open fires or unvented stoves (WHO 2014b). The rural/urban ratio in use of solid fuels is 2.3 in countries in the lowest and, 11.7 in the highest quartile of the Human Development Index (http://hdr.undp.org/en/content/human-development-index-hdi). The Living Standards Measurement Survey (World Bank 2012) conducted in Guatemala demonstrated the highest reliance on solid fuel—up to 95% in some regions—among indigenous populations in rural areas.
Ten-fold disparities in death rates attributable to indoor air pollution are seen across Latin American countries and range from a high of 14 in the least developed countries, down to 0.3 for high-income countries (WHO 2014b). Thus in 2012, ≥ 50% of the populations of Guatemala, Haiti, Honduras, and Nicaragua used solid fuels as their main energy source (WHO 2014b). Even in urban areas of the less-developed countries of the Americas, a high percentage of the population relies on solid fuels (Soares da Silva et al. 2013; WHO 2014b).
Since 1990 the region has experienced a steady decline in the percentage of the population using solid fuels and the size of the population exposed (Bonjour et al. 2013). Some countries can make the transition to cleaner fuels, but others will likely continue to use solid fuels because of lack of infrastructure and the high costs associated with transition to gas and electricity.
Interventions are underway, especially in areas of the Americas, to introduce new cookstoves that use solid fuels more efficiently and are less polluting. A major study of this intervention in Guatemala found that using clean stoves was associated with a 30% reduction in severe pneumonia among children < 18 months of age (Smith et al. 2011). A study in Peru found that using the new cookstoves significantly reduced sleep and respiratory symptoms in children 2–14 years of age, but only in households that used the less-polluting stoves exclusively and with adequate maintenance (Accinelli et al. 2014).
Ambient air pollution. Children in the mega-cities of Latin America—Mexico City, Mexico; Santiago, Chile; and São Paulo, Brazil—are exposed to high levels of air pollution (WHO 2014d). This pollution is associated with poor respiratory health (de Medeiros et al. 2009; Romieu et al. 2003). Even in smaller cities, ambient air pollution from stationary and mobile sources has also been shown to negatively affect children’s respiratory health (Wichmann et al. 2009).
Important research on air pollution and its health effects has been undertaken in Latin America (PAHO 2012b). de Medeiros et al. (2009) conducted a case–control study in 14 districts of São Paulo that showed that infants born to women in regions with the highest levels of traffic-related pollution (upper quintile) had an almost 50% increased risk of early neonatal death compared with those living in areas with the lowest pollution [adjusted odds ratio (OR) = 1.47; 95% confidence interval (CI): 0.67, 3.19]. Exposure to traffic-related pollution in Latin America has been associated with increased otitis media (Brauer et al. 2006), increased asthma, more severe asthma symptoms, and lower lung function (Barraza-Villarreal et al. 2011; Romieu et al. 2008; Wichmann et al. 2009).
The source of air pollution has been shown to influence the resulting health effects. In a study from La Plata, Argentina, children exposed to industrial pollution near a major petrochemical refining area had a pattern of respiratory impairment that was different from that of children living in regions of the city with predominantly traffic-related pollution (Wichmann et al. 2009). Risk of asthma (OR = 2.76; 95% CI: 1.96, 3.89), acute asthma exacerbations (OR = 1.88; 95% CI: 1.25, 1.83), and wheeze (OR = 1.93; 95% CI: 1.39, 2.67) were all increased among children living in the industrial area. By contrast, low lung function and airway obstruction were more common among children with exposure to air pollutants of automotive origin.
Lead. The Americas account for one-third of global lead production (PAHO 2011), and lead is widespread in the Latin American environment. Lead is responsible for 1% of the global burden of disease (Fewtrell et al. 2004). About 99% of all children affected by exposure to lead live in low- and middle-income countries (Suk et al. 2003). Children living in poverty are most likely to be exposed to lead (Rojas et al. 2003; Seijas and Squillante 2008).
Smelters and battery factories are important sources of lead exposure in Latin America, especially for children living close to these plants. A mean blood lead level (BLL) of 17.1 μg/dL, with a range from 2.0–36.2 μg/dL, was reported in a population living near an industrial facility in Uruguay (Mañay et al. 2008). Other sources of exposure include e-waste, lead paint, battery recycling, lead pipes, and the burning of solid waste (Anticona et al. 2011; Coria et al. 2009; Manzanares-Acuña et al. 2006; Sánchez-Cortez et al. 2003). Contaminated waste sites and dumps containing industrial, metallurgic, and mining wastes such as La Oroya and el Callao in Peru, Abra Pampa in Argentina, and La Teja in Uruguay are responsible for some of the most severe lead exposure scenarios in the region (Espinoza et al. 2003; Garcia and Mercer 2003; Rubio-Andrade et al. 2011; Schütz et al.1997).
Public health interventions to reduce lead exposure have begun to yield positive results in Latin America. Although there is no uniform epidemiologic database that tracks BLLs across the region, protocols to reduce lead exposure and to monitor children’s lead exposure are being put in place in various countries such as Mexico (Recio-Vega et al. 2012), Peru (Ministerio de Salud Publica, Republica del Peru 2007), Argentina (Ministerio de Salud, Republica de Argentina 2013), and Uruguay (Ministerio de Salud Publica, Republica Oriental del Uruguay 2011). CEH units (WHO 2010b) and referral centers for diagnosis and prevention of lead poisoning have been established (Laborde 2004). Some countries such as Chile (Ministerio de Salud, Comision Nacional del Medio Ambiente, Gobierno de Chile 2009) and Uruguay [Ministerio de Vivienda, Ordinamiente Teritorial y Medio Ambiente, Republica Oriental del Uruguay (MVOTMA) 2012] have established legislation regulating battery recycling. Argentina (Ministerio de Salud, Republica de Argentina 2009), Brazil, Chile (Biblioteca del Congreso Nacional de Chile, Ministerio de Salud, Gobierno de Chile 1997), and Uruguay (MVOTMA 2011) have established national regulations limiting the lead content of lead in residential paints.
The phase-out of lead from gasoline has been a particularly important advance (Franco-Netto et al. 2003). Until leaded gasoline was banned, BLLs > 10 μg/dL were found in 10–40% of children in urban areas in Latin America, with the highest levels in countries that used leaded gasoline. Children’s BLLs in Latin America have declined following the removal of lead from gasoline (Romieu et al. 1995; Sánchez-Cortez et al. 2003).
Further research is needed in Latin America to identify additional sources of environmental exposure to lead, to screen children at risk, and to guide educational, nutritional, environmental, and medical interventions that will further reduce children’s exposures to lead (Kordas et al. 2010; Vega-Dienstmaier et al. 2006).
Mercury. Mercury contamination found in many areas of Latin America poses serious threats to children’s health. Artisanal gold mining uses mercury to remove gold from ore and is a major source of this contamination (Gibb and O’Leary, 2014; Wade 2013). Occupational and para-occupational exposures to metallic mercury, including exposures to children, are extensive in artisanal gold mining, and neither preventive nor protective measures are regularly used (Bose-O’Reilly et al. 2008; Cordy et al. 2011). Formation of highly neurotoxic methyl mercury from metallic mercury that enters streams and rivers is a further hazardous consequence of artisanal gold mining (Grandjean et al. 1999).
A study of pediatric mercury exposure in the mining area of Camilo Ponce Enriquez, Ecuador, within the framework of PHIME (Public Health Impact of long-term, low-level Mixed Element exposure in susceptible population strata) reported a geometric mean mercury concentration in blood of 3.23 μg/L (range, 1.0–25 μg/L) among 69 children 7–10 years of age (Hrubá et al. 2012; Pawlas et al. 2013). Additional studies in urban and rural communities around this mining area also demonstrated elevated levels of mercury in blood (Hrubá et al. 2012; Pawlas et al. 2013).
Asbestos. Global consumption of asbestos has declined over the past 25 years as a steadily increasing number of countries have recognized the health hazards and taken legal action to restrict or ban asbestos use. The use of asbestos has been virtually eliminated in most industrially developed countries. Current annual global consumption is about 2 million tons, and virtually all of that use takes place in developing countries (Virta 2009).
In Latin America, progress is being made in reducing asbestos use. Argentina, Chile, Uruguay, and Honduras have all banned asbestos. Consumption is declining in other countries, even where it is not actually illegal. But progress is slow and not necessarily irreversible. Indeed some sources report rising asbestos consumption in a handful of countries such as Mexico and El Salvador (Roselli 2014).
The two largest users of asbestos in Latin America are Brazil and Colombia, and both are also asbestos producers (Castleman 1999). In 2012, Brazil produced 306,500 tons of asbestos and was the world’s third largest producer (Virta 2012). Annual production in Colombia in 2003 and 2004 was an estimated 60,000 tons (Roselli 2014). About 80% of the asbestos used in Brazil is consumed in the form of asbestos cement: for roof tiles and roofing panels, wall-board, and domestic and industrial water tanks (Berman 1986).
Arsenic. Arsenic is a metalloid element that occurs naturally in the earth’s crust in organic and inorganic forms (Naujokas et al. 2013). High concentrations are also released into the environment by polluting industries. Worldwide, drinking water is the principal source of arsenic exposure, but inhalation can be an important exposure route for people living near polluting industries as well as for children working in mining and smelting. Arsenic is widely distributed in the environment of Latin America, and elevated levels have been documented in drinking water in areas of several countries, most notably Chile, Argentina, and Mexico (Bundschuh et al. 2012).
Inorganic arsenic is classified by the International Agency for Research on Cancer (IARC) as a class I human carcinogen (IARC 2012). Inorganic arsenic compounds have been shown in human studies to cause cancer of the lung, urinary bladder, and skin. Also, positive associations have been observed between inorganic arsenic compounds and cancer of the kidney, liver, and prostate. Inorganic arsenic is also associated with cardiovascular disease.
Prenatal and pediatric exposures to arsenic in Latin America have been linked to adverse perinatal, childhood, and adult health outcomes. Some of the most detailed studies of these effects were conducted in Antofagasta in northern Chile, where the arsenic concentration in the public drinking-water supply rose sharply between 1958 and 1970 because of a contaminated water source.
Perinatal arsenic exposures in Antofagasta were linked to increases in late fetal, neonatal, and postneonatal mortality (Hopenhayn-Rich et al. 2000). In childhood, an increased number of skin lesions were reported in exposed children, and chronic cough was reported by 38.8% of children with arsenic-related skin lesions, compared with 3.1% of children with normal skin (Borgoño et al. 1977). Last, a cancer epidemiology study in Antofagasta found that arsenic exposures in early life were strongly associated with increased mortality from bladder cancer, laryngeal cancer, liver cancer, and chronic renal disease in adults < 50 years old (Smith et al. 2012). A similar pattern of cancer risk was demonstrated in people chronically exposed to elevated levels of arsenic in groundwater in northern Argentina (Aballay et al. 2012).
Several well-conducted prospective epidemiological studies have linked pediatric and prenatal exposures to arsenic with decreases in learning ability and neurodevelopmental abnormalities (von Ehrenstein et al. 2007; Wasserman et al. 2004). More recently, a study of children living in an area of Torreon, Mexico, contaminated with both arsenic and lead, showed that arsenic contamination can affect children’s cognitive development, independent of any effect of lead (Rosado et al. 2007).
Control of arsenic exposure can reduce health risks, but studies in Antofagasta demonstrate that the elevated rates of cancer can persist for many years after cessation of high-dose exposure (Steinmaus et al. 2013).
Pediatric cancer. Children around the world, including children in Latin America are at risk of exposure to multiple carcinogens in air, water, food, and soil. These exposures can cause pediatric cancer, which accounts for about 1% of all reported cancers (Buka et al. 2007) and also lead to cancers in adult life (Smith et al. 2012). Children are highly vulnerable to environmental carcinogens because of their unique patterns of exposure, rapid growth and development, dynamic physiology, and long life expectancy (NRC 1993).
A population-based case–control epidemiologic study in Costa Rica identified an association between parental exposures to pesticides during and before pregnancy and increased risk of childhood leukemia (Monge et al. 2007). A small case–control study in Mexico also found some evidence for an association between childhood acute leukemia and domestic or garden use of pesticides in the 3 months before pregnancy (Hernández-Morales et al. 2009). Last, a large hospital-based case–control study showed associations between using pesticides during pregnancy and acute lymphoid leukemia and acute myeloid leukemia (Ferreira et al. 2013).
Monitoring releases from industry to air, water, and land and making this information public is an important strategy for controlling environmental exposures to carcinogens and other toxic chemicals (UN 2013). Long used in North America and Europe, this approach is now spreading to Latin America. In 2006, the Registro de Emisiones y Transferencia de Contaminantes in Mexico collected the first emissions data, which included 104 chemicals from > 1,000 industries, and made the data public (Commission for Environmental Cooperation 2013).
Pesticides. Pesticide use is widespread in Latin America. According to PAHO, the region spends nearly US$3 billion each year on pesticides (PAHO 2011). In Central America, PAHO has tracked a steady increase in acute pesticide poisoning cases each year for the past two decades, and this trend closely parallels upward trends in pesticide imports (Henao and Arbelaez 2002).
Acute pesticide poisoning is widespread in Latin America, and PAHO estimates that acute pesticide poisoning cases are underreported by 50–80% (PAHO 2011). Between 2003 and 2006, the Montevideo Poison Control Center (http://www.ciat.hc.edu.uy) received 18,110 consultations involving people < 15 years of age, and > 15% of these consultations were related to pesticides (Juanena et al. 2011). Epidemiologic studies in Ecuador, Costa Rica, and Nicaragua indicate that organophosphate and carbamate insecticides are the most frequent source of acute pesticide poisoning in people of all ages (Bovi de De Pascuale et al. 1995; Wesseling et al. 1997, 2005).
Acute pesticide poisoning in children can result from nonintentional ingestion of pesticides stored in medicine or soft drink bottles or when pesticide containers are reused for storing drinks or food (Juanena et al. 2011). Dermal exposure occurs when parents use the pesticide to treat scabies or head lice; lindane and the pyrethroids are the pesticides most commonly used in this application (Rodríguez et al. 2007). Studies of knowledge, attitudes, and practices indicate that unsafe use of pesticides is a common problem in Latin American countries (Cervantes Morant 2010).
Chronic exposure to pesticides is also widespread among children in Latin America. Pathways of chronic exposure include drift from sprayed fields, persistence in sprayed homes, and water or food contamination (de Carvalho Dores and De-Lamonica-Freire 2001; Dutra Caldas and de Souza Kenupp 2000).
Latin American children are occupationally exposed to pesticides because they represent a substantial part of the agricultural workforce and begin work at a young age (González-Andrade et al. 2010; Tomasina and Laborde 2010). Decreases in cholinesterase levels have been reported over the course of a growing season in children living in rural areas (Bovi de De Pascuale et al. 1995; Henao and Arbelaez 2002). Parental occupational exposures can indirectly influence child health when toxicants are carried home on parents’ contaminated work clothes or other objects. Many toxicants encountered by women at work can also be transmitted to their infants via breast milk (McDiarmid and Gehle 2006; Mutanen and Hemminki 2001).
The developmental toxicity of pesticides has been studied in Latin America. Alterations in fetal growth and length of gestation have been reported in children born to mothers with agricultural exposure to pesticides during pregnancy (Cecchi et al. 2012; Souza et al. 2005, 2006). Risk factors for these effects included living near treated fields, storage of pesticides at home, and direct or accidental contact with pesticides (Benítez-Leite et al. 2009). Investigations in Ecuador found that prenatal exposure to pesticides is associated with severe adverse effects on brain development in children, even at low levels of exposure (Harari et al. 2010). Handal et al. (2007) showed that residence in communities with high potential for exposure to organophosphate and carbamate pesticides was associated with poorer neurobehavioral development. Malnourished populations may be particularly vulnerable to these neurobehavioral effects (Handal et al. 2007). It has been reported that exposure to pesticide mixtures in agriculture-intensive areas in Uruguay may increase risk for early-onset respiratory disease (Laborde et al. 2006). Occupational contact with pesticides and other chemicals is another route of prenatal exposure. Physiologic changes that occur in pregnancy may increase the toxicity of certain chemical exposures (McDiarmid and Gehle 2006; Paul and Himmelstein 1988).
Biomarkers have been used to study pesticide exposure in Latin American children. A recent study in Argentina evaluated saliva sampling as a tool for biological monitoring and suggested that salivary carboxylesterase levels might be a sensitive, noninvasive biomarker for assessing pediatric exposure to organophosphate pesticides (Bulgaroni et al. 2012).
Hazardous waste sites. Toxic waste sites are a major, and heretofore underrecognized, global health problem, especially in developing countries (Naujokas et al. 2013). PAHO estimates that 500,000 people in the Americas live on or close by a hazardous waste site (PAHO 2011).
Recent studies have found that hazardous waste sites are major contributors to the burden of disease in low- and middle-income countries and are responsible for a disease burden comparable to those caused by outdoor air pollution and malaria (Chatham-Stephens et al. 2013). Exposures in early life to pesticides and toxic chemicals from hazardous waste sites may cause severe developmental defects and entail lifelong health consequences (NRC 1993).
E-waste. E-waste disposal sites represent a relatively new and rapidly growing type of hazardous waste site in Latin America and around the world (Araújo et al. 2012; Cyranek and Silva 2010; Gavilán-García et al. 2009; Steubing et al. 2010). More than 45 million tons (Noel-Brune et al. 2013) of e-waste were generated globally in 2012, and these numbers are expected to rise in coming years (UN 2012; Zoeteman et al. 2010). Significant amounts of e-waste are exported from developed countries to developing countries, including Latin American countries, where recycling of valuable compounds from e-waste, such as copper and gold, has evolved into an important business, predominantly in the informal sector (Gunsilius et al. 2011; UNEP 2010).
E-waste contains a vast number of hazardous chemicals including lead, cadmium, mercury, nickel, barium, and lithium, as well as persistent organic pollutants such as polychlorinated biphenyls (PCBs) and brominated flame retardants (Cyranek and Silva 2010; Lundgren 2012; UNEP 2010; WHO 2010c). Unsafe recycling activities such as open burning and acid leaching of e-waste produce toxic combustion products including dioxin-like PCBs, and polychlorinated dibenzo-dioxins and -furans (PCDD/Fs) (Frazzoli et al. 2010).
E-waste may pose significant health risks to children, especially child workers (Wu et al. 2010). Children may also be confronted with hazardous substances through take-home exposures and home-based e-recycling workshops. Children at e-waste sites have been reported to display elevated levels of multiple toxic chemicals including lead (Huo et al. 2007; Xu et al. 2012), nickel (Zheng et al. 2013), manganese (Zheng et al. 2013), and chromium (Li et al. 2008a). These exposures are associated with a range of adverse health effects, including injury to children’s immune, cardiovascular, gastrointestinal, renal, endocrine, and hematological systems; adverse birth outcomes, such as stillbirth and lower APGAR scores; reduced pulmonary function; effects on child physical growth; and altered neurobehavioral development (Li et al. 2008a, 2008b; Liu et al. 2011; WHO 2010a; Yang et al. 2013; Zheng et al. 2013).
Analyses of e-waste in Latin America project increasing regional levels of e-waste generation in future years (Cyranek and Silva 2010; Gavilán-García et al. 2009; Steubing et al. 2010) and discuss the need for development of comprehensive national systems for e-waste management (de Oliveira et al. 2012).
Regional climate change and children’s health. Despite the global nature of climate change, it produces highly variable local impacts and specific effects. Children are especially vulnerable to these effects (Sheffield and Landrigan 2011).
Ecuador provides a case study within Latin America of the varied local effects of climate change. Ecuador is one of the most highly biodiverse countries in the world, with its tropical forest (Amazonia), Andes, and coastal regions each having a distinct ecosystem (Bass et al. 2010). In the vulnerable ecosystem of Amazonia, highly aggressive wood production and petroleum extraction have led to deforestation (Ministerio del Ambiente, República del Ecuador 2003), which in concert with the increased rainfall associated with global climate change has produced increased risk of landslides and flooding. In the Andes, glaciers are melting so fast that future water supplies are threatened and desertification is accelerated (Bradley et al. 2006; Francou et al. 2011; PAHO 2011). On the coast, extreme heat events are increasing in frequency (Ministerio del Ambiente, República del Ecuador 2012).
Increased ultraviolet radiation from depletion of stratospheric ozone is a consequence of climate change observed to especially affect people in the high Andes of Ecuador (PAHO 2012b; Pinault and Hunter 2011). Skin cancer is now the second most frequent form of cancer in Ecuador (Cueva and Yépez 2009).
Increased evaporation of pesticides because of increased thermal stress is yet another consequence of climate change (Chen and McCarl 2001; Noyes et al. 2009; Sciedeck et al. 2007). This effect has been documented in Latin America at banana plantations, which are heavy consumers of multiple pesticides. To evaluate children’s exposure to chlorpyrifos in villages situated near banana plantations and plantain farms, a cross-sectional study in Costa Rica examined urinary levels of 3,5,6-trichloro-2-pyridinol (TCPy), a biomarker for chlorpyrifos exposure, in 140 mostly indigenous children. The study targeted two villages that were situated close to plantations that used chlorpyrifos and one comparison village with mainly organic production. The main finding was that children from the villages near the plantations that used pesticides had significantly higher urinary TCPy concentrations than did children from the control village. Chlorpyrifos was detected in 30% of the environmental samples as well as in 92% of the hand/foot wash samples in the villages near the pesticide-using plantations (van Wendel de Joode et al. 2012).
Adverse socioeconomic conditions such as high rates of poverty, inadequate industrial development, low productivity in traditional agriculture, and lack of safe drinking water can magnify vulnerability to climate change in Latin American countries (Harari and Harari 2006). The lack of public services that is common in some socially isolated areas further increases societal vulnerability (McMichael et al. 2004; PAHO 2011; PAHO and WHO 2007).
Chronic diseases are on the rise among children in Latin America. These diseases include asthma, neurodevelopmental disorders, birth defects, obesity, diabetes, cardiovascular disease, mental health problems, and pediatric cancer. Their increase is part of a profound regional shift in patterns of morbidity and mortality—an epidemiological transition (Barreto 2004; Barreto et al. 2012; Marinho et al. 2013). Although the pace of this transition is uneven and varies from country to country depending on degree of industrial development, urbanization, and socioeconomic status, the trend away from the ancient infectious diseases and toward chronic, noncommunicable disease is clear and is accelerating in Latin America and around the world (UN 2011).
Concomitant with the epidemiological transition, far-reaching environmental changes have swept Latin America. These include urbanization, industrialization, changes in patterns of land use, deforestation, and the effects of regional climate change. Environmental degradation has occurred in many areas.
Toxic chemicals in the environment have become an important problem and are recognized as major causes of disease and disability among children in Latin America. Chemicals including lead, mercury, industrial chemicals, air pollution, pesticides, and chemicals from e-waste have been documented to be responsible for a wide range of illnesses among children in the region (Hopenhayn-Rich et al. 2000; Hrubá et al. 2012; Mañay et al. 2008; Romieu et al. 2003; Wesseling et al. 2005; WHO 2014c).
To confront the crisis of chronic disease of environmental origin among children in Latin America, WHO, including PAHO, plans to build on current efforts and concentrate resources on a carefully selected short list of the most pressing problems, which include the following:
- Indoor and outdoor air pollution, which together led to > 7 million deaths worldwide in 2012—131,000 of them in low- and middle-income countries in the Americas (WHO 2014a).
- Water pollution (PAHO 2012a; WHO 2000).
- Toxic chemical hazards (WHO 2010d, 2014a).
WHO, including PAHO, plans to move forward in CEH in the following areas:
- Develop tracking data for Latin America on trends on CEH, including updated estimates of the burden of disease due to environmental factors.
- Develop a network of Collaborating Centres, collaborators, and experts from research institutions, academia, health and environment sectors, policy makers, governments, and nongovernmental organizations in the LAC countries and worldwide to ensure that the best experts and key players are involved (Sly et al. 2014).
- Conduct studies of the economic costs of asthma, obesity, and neurodevelopmental problems as well as studies of the economic benefits that will accrue to societies worldwide through control of these hazards.
- Support the development of policies prioritized on the global burden of disease and economic costs of exposures of environmental exposures.
- Promote biomedical research in CEH including toxicological and biomarker research, multi-year longitudinal birth cohort studies, and shorter-term epidemiological studies of pressing problems such as endocrine disruptors, environmental causes of neurodevelopmental disorders, and environmental causes of asthma. This research will provide a blueprint for evidence-based prevention and environmental intervention.
- Build regional capacity in CEH, focusing on the health sector, addressing new audiences, and promoting tools such as environmental health questionnaires (the “Green Page”; WHO 2012) and referral centers such as CEH units (WHO 2010b).
- Develop a platform for dialogue with other UN agencies, such as United Nations Environment Programme and UNICEF (United Nations Children’s Fund), to share information and work together in common objectives.
In the 21st century, the protection of children’s health and the prevention of pediatric disease of environmental origin in Latin America and around the world will require a highly focused, visible, and sustainably funded strategy that focuses on the most important health threats.
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Recent Advance Publications
Urban Dust Microbiome: Impact on Later Atopy and Wheezing
Use of Cooking Fuels and Cataract in a Population-Based Study: The India Eye Disease Study
Particulate Air Pollution and Fasting Blood Glucose in Non-Diabetic Individuals: Associations and Epigenetic Mediation in the Normative Aging Study, 2000-2011
Persistent Organic Pollutants and the Association with Maternal and Infant Thyroid Homeostasis: A Multipollutant Assessment
A Systematic Comparison of Linear Regression-Based Statistical Methods to Assess Exposome-Health Associations