Critique Table 3.
Comparison of Mean Air Pollutant Concentrations in Wuhan, China, with Ambient Air Quality Standards and Guidelines
| Pollutant | Air Pollutant Concentration in Wuhan | U.S. EPA NAAQS | WHO AQ Guidelines | ||
|---|---|---|---|---|---|
| Annual Average 24-hr Concentrationa (μg/m3) | 25th Percentile | 75th Percentile | |||
| PM2.5 | 70.8 | 62.2 | 75.7 | 15 μg/m3, annual mean 35 μg/m3, 24-hr mean |
10 μg/m3, annual mean 25 μg/m3, 24-hr mean |
| PM10 | 101.9 | 93.4 | 108.4 | 150 μg/m3, 24-hr mean |
20 μg/m3, annual mean 50 μg/m3, 24-hr mean |
| SO2 | 35.3 | 30.8 | 38.8 | 0.5 ppm (1,410 μg/m3), 3-hr mean |
20 μg/m3, 24-hr mean 500 μg/m3, 10-min mean |
| NO2 | 58.8 | 53.9 | 63.7 | 100 ppb (188 μg/m3), 1-hr mean 53 ppb (99.64 μg/m3), annual mean |
40 μg/m3, annual mean 200 μg/m3, 1-hr mean |
| CO | 1012.4 | 926.6 | 1097.8 | 9 ppm (11,100 μg/m3), 8-hr mean 35 ppm (43,200 μg/m3), 1-hr mean |
No guideline |
| O3 | 75.0b | 63.5 | 85.3 | 0.070 ppm (148 μg/m3), 8-hr mean |
100 μg/m3, 8-hr mean |
a Source: IR Table 3.
b 8-hr average.
Abbreviations: AQ = air quality; U.S. EPA NAAQS = United States Environmental Protection Agency National Ambient Air Quality Standards; WHO = World Health Organization.