Table 2.

RRs and 95% CIs of daily COVID-19 confirmed cases associated with per IQR increase in pollutant concentration (AQI, NO₂, PM_2.5, PM₁₀, CO, SO₂, O₃) in single-lag models.

Air Pollutants	Lag Days	RR	95% CI
AQI	LAG 0-15	1.09	1.06–1.12
CO	LAG 0-25	0.81	0.78–0.83
NO2	LAG 0-20	1.19	1.14–1.24
O3	LAG 0-10	0.96	0.93–1.00
PM2.5	LAG 0-15	1.06	1.03–1.08
PM10	LAG 0-15	1.07	1.04–1.09
SO2	LAG 0-25	0.82	0.78–0.85