Figure 1 (IMAGE) University of California - San Diego Caption Figure 1: Pollution and demographic data used in this study. A,B Average surface PM2.5 and tropospheric NO2 concentrations in the pre-shutdown period of 2020 in California, United States. C Median income ($USD) in each census block group from the U.S. Census Bureau 2018 5-year American Community Survey (ACS). D-F Share of the population in each census block group that is Hispanic, Asian, or Black, from the ACS. G Schematic showing the many slower-changing (assumed to be static over shorter periods) and higher-frequency factors that contribute to heterogeneous pollution exposures. Credit UC San Diego Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.