Fig. 4.
Pooled RRs (95% CI) of daily newly COVID-19 confirmed cases associated with a 10-ug/m3 rise in (a) PM2.5 at lag 1-14; (b) 03 at lag 0-1; (c) SO2 at lag 0, and (d) NO2 at lag 0-14, with and without adjustment for other airborne pollutants
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