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 1. A comparison of ensemble-based source profiles for warm and cold seasons for Atlanta, Georgia; Birmingham, Alabama; St. Louis, Missouri; and Dallas, Texas.
Source of PM2.5 Number of citiesa Correlationb nRMSD (%)c Pairwise comparisonsd
Notes: nRMSD, normalized root mean squared difference.
aNumber of cities where each source was identified.
bAverage (minimum, maximum) correlation between EBSPs across cities for each season.
cAverage (minimum, maximum) percent nRMSD comparing EBSPs across cities for each season.
dNumber of pairwise comparisons made for EBSPs between cities for each season.
Biomass burning 4 0.99 (0.97, 1.00) 4.20 (2.04, 6.35) 12
Diesel vehicles 4 1.00 (1.00, 1.00) 2.30 (1.44, 3.66) 12
Gasoline vehicles 4 1.00 (1.00, 1.00) 2.10 (0.93, 3.54) 12
Dust 4 1.00 (0.99, 1.00) 2.52 (1.20, 4.26) 12
Coal combustion 3 0.69 (0.48, 0.98) 23.80 (11.45, 30.65) 6
Metals 2 0.67 (0.59, 0.74) 38.77 (37.46, 40.08) 2