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The stratified estimation of seven distinguished areas of RRs and 95% CIs of daily COVID-19 confirmed cases associated with per IQR increase in pollutant concentration (AQI, NO2, PM2.5, PM10, CO, SO2, O3) in single-lag models. Note: the ∗ of SO2 in Hubei Province was 8.43 (95%CI: 5.76–12.34). L1-L5 related to Lag 0–5, Lag 0–10, Lag 0–15, Lag 0–20, Lag 0–25 respectively.
