Table 2.

Excess risk and 95% confidence intervals of emergency ambulance dispatches for each 10 μg/m³ increment in PM pollution at lag03 in single and two-pollutant models in Guangzhou

Pollutants	Models	All-cause	Cardiovascular	Respiratory
PM2.5
	Single pollutant model	0.98 (0.67, 1.28)	0.69 (0.00, 1.39)	1.14 (0.25, 2.04)
	Two-pollutant models
	Control for NO2	0.46 (0.09, 0.83)	0.07 (− 0.78, 0.92)	1.21 (0.12, 2.31)
	Control for O3	1.11 (0.79, 1.44)	0.74 (0.00, 1.49)	1.35 (0.40, 2.31)
	Control for SO2	0.96 (0.65, 1.27)	0.61 (− 0.10, 1.33)	1.03 (0.12, 1.94)
PM2.5–10
	Single pollutant model	2.06 (1.44, 2.68)	2.04 (0.64, 3.45)	2.52 (0.72, 4.35)
	Two-pollutant models
	Control for NO2	1.05 (0.30, 1.79)	1.07 (−0.64, 2.81)	2.82 (0.60, 5.10)
	Control for O3	2.26 (1.61, 2.91)	2.17 (0.70, 3.66)	2.89 (0.99, 4.82)
	Control for SO2	2.03 (1.40, 2.66)	1.89 (0.47, 3.34)	2.29 (0.45, 4.15)
PM10
	Single pollutant model	0.75 (0.53, 0.96)	0.60 (0.11, 1.10)	0.89 (0.25, 1.52)
	Two-pollutant models
	Control for NO2	0.38 (0.12, 0.65)	0.18 (−0.44, 0.80)	1.02 (0.22, 1.83)
	Control for O3	0.85 (0.62, 1.08)	0.65 (0.13, 1.18)	1.05 (0.38, 1.73)
	Control for SO2	0.74 (0.52, 0.96)	0.55 (0.04, 1.05)	0.80 (0.16, 1.45)