Fig. 4: Association of PM2.5 SOA subcomponents with death rates across the contiguous U.S. (n = 2708 counties) in black and southeastern (SE) U.S. (n = 646 counties) in red (open symbol) determined via regressed coefficients (β) from multiple linear regression and their 95% confidence intervals (whiskers).
From: Secondary organic aerosol association with cardiorespiratory disease mortality in the United States

Model forms are single pollutant (SP, circles) and multipollutant with refinement of SOA subcomponents (MP SOA, triangles). SOABVOC and SOAAVOC are from the oxidation of VOCs that are predominantly biogenic and anthropogenic in origin, respectively. Regressed coefficients correspond to IQR-normalized species concentrations in units of deaths per 100,000 in population.