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. 2014 Jul 8;122(11):1216–1224. doi: 10.1289/ehp.1307772

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Variance of exposure error. (A) Variance of normalized exposure error (δ) for local and regional pollutants (see Supplemental Material, Figure S4, for full extent of data and outliers). The bottoms and tops of boxes represent 25th and 75th percentiles, lines within boxes indicate the median, and the whiskers represent 5th and 95th percentiles; n = 193. δ_spatial = AQ – CS; δ_population = PE – AQ; and δ_total = PE – CS. (B) Map showing variance of δ_spatial of NO_x for ZIP codes in the Atlanta metropolitan area. Blue and brown lines indicate major roads; colors represent percentiles, where 5% = 0.58; 25% = 0.72; 50% = 0.83; 75% = 1.14; and 95% = 4.14.