Figure 1.
Distribution of traffic density and background air pollutant concentrations at ARIC participant residences (1987–1989). (A) Traffic density (n=13,143). (B) PM10 (μg/m3; n =13,143). (C) NO2 (ppb; n=10,020).
Distribution of traffic density and background air pollutant concentrations at ARIC participant residences (1987–1989). (A) Traffic density (n=13,143). (B) PM10 (μg/m3; n =13,143). (C) NO2 (ppb; n=10,020).