Credit: UC San Diego School of Global Policy and Strategy
a,b, Average surface PM2.5 (a) and tropospheric NO2 (b) concentrations in the pre-shutdown period of 2020 in California, United States. c, Median household income (US$) in each CBG from the US Census Bureau 2018 5 yr American Community Survey (ACS). d–f, Share of the population in each CBG that is Hispanic (d), Asian (e) or Black (f), from the ACS. g, Schematic showing both slower-changing (assumed to be static over shorter periods) and higher-frequency factors that contribute to heterogeneous pollution exposures. Symbols in g courtesy of Noun Project: Automobile by Symbolon; Income and Highway by Vectors Point; Urban by Eucalup; weather by asianson.design; List by Richard Kunák; inequality by b farias.