Table 3.

The overall estimated RR values for air pollutants at different levels with a lag of 14 days

	Moderate level	High level
PM2.5	0.77 (0.64–0.92)	0.71 (0.46–1.09)
SO2,	1.06 (0.87–1.29)	2.32 (1.42–3.79)
NO2	0.85 (0.68–1.07)	2.01 (1.22–3.31)
O3-8 h	2.12 (1.47–3.05)	1.02 (0.69–1.53)