Table 4: The reduction in COPD mortality (%) if air pollution attained the target levels from 2007 to 2011.

From: The burden of COPD mortality due to ambient air pollution in Guangzhou, China

Target levels (μg/m3)#Attributable fraction (%, 95% CI)#
PM10SO2NO2
No pollution (0,0,0)10.91 (1.02–19.58)12.71 (5.03–19.85)13.38 (2.67–22.84)
NAAQS (150,80,150)0.23 (0.02–0.44)0.66 (0.25–1.07)0.05 (0.01–0.08)
50% of NAAQS (75,40,75)2.27 (0.20–4.21)3.50 (1.34–5.58)1.49 (0.28–2.67)
20% of NAAQS (30,16,30)6.72 (0.60–12.28)8.13 (3.22–12.74)7.15 (1.37–12.50)
WHO targets (50,20,-)4.31 (0.38–7.94)7.15 (2.82–11.24)
  1. #The target levels of PM10, SO2 and NO2 are shown in parentheses; NAAQS: Chinese national ambient air quality standards.