Associations between Source-Specific Fine Particulate Matter and Emergency Department Visits for Respiratory Disease in Four U.S. Cities

http://dx.doi.org/10.1289/EHP271



Table 2. Average (standard deviation) concentration and median of city-specific interquartile ranges in micrograms/cubic meter for PM2.5 mass and primary source-specific PM2.5 for four U.S. cities.a
Pollutant Atlanta, GA Birmingham, AL St. Louis, MO Dallas, TX IQR
Notes: IQR, interquartile range; PM2.5, fine particulate matter
aAvailable days of source-specific PM2.5: 3,624 days for Atlanta, Georgia; 808 days for Birmingham, Alabama; 728 days for St. Louis, Missouri; and 332 days for Dallas, Texas.
PM2.5 mass 15.55 (7.82) 17.00 (9.25) 13.56 (7.07) 10.71 (4.62) 9.16
Biomass burning 1.60 (1.17) 1.05 (1.04) 1.31 (0.95) 1.36 (0.95) 0.95
Diesel vehicles 1.19 (1.16) 1.02 (1.32) 0.72 (0.80) 0.30 (0.52) 1.11
Gasoline vehicles 1.01 (0.94) 0.70 (0.75) 1.11 (0.61) 0.48 (0.38) 0.72
Dust 0.43 (0.44) 0.60 (0.72) 0.46 (0.69) 0.65 (1.08) 0.33
Coal combustion 0.13 (0.12) 0.23 (0.30) 0.01 (0.02) 0.13
Metals 0.64 (0.57) 0.23 (0.24) 0.43