Extended Data Fig. 4: Same as Fig. 3, but for weekly NO2.
From: Disparate air pollution reductions during California’s COVID-19 economic shutdown
Since NO2 measurements are from the TROPOMI satellite instrument, they cover all census block groups in California. Qualitative differences between NO2 estimates (A,C,E) and Fig. 3a,c,e thus represent a combination of coverage, and differences in PM2.5 and NO2 distributions. Differences in mobility between these estimates (B,D,F) and Fig. 3b,d,f are due to coverage differences (representing mobility in all census block groups here and mobility census block groups with Purple Air stations for Fig. 3) and weekly versus daily analysis. Values of the coefficients in parts A and C are given in Table S6 and part E in Table S7.
