Table 2.
Summary of long-term and short-term exposure levels of PM2.5 and O3 pollution. Data sources: Tracking Air Pollution in China database, http://tapdata.org.cn/, [33,34].
| Population percentage in areas where annual average PM2.5 exceeded the standard | Days of population-weighted average PM2.5 that exceeded the standard | |||
|---|---|---|---|---|
| Year | 2015 | 2020 | 2015 | 2020 |
| Countrywide | 76% | 43% | 75 Days | 27 Days |
| BTH | 100% | 99% | 182 Days | 64 Days |
| FWP | 99% | 92% | 86 Days | 58 Days |
| YRD | 92% | 37% | 79 Days | 23 Days |
| SCB | 96% | 46% | 72 Days | 24 Days |
| PRD |
42% |
0% |
13 Days |
1 Day |
| Population percentage in areas where annual average MDA8 O3 exceeded the standard |
Days of population-weighted average MDA8 O3 that exceeded the standard |
|||
| Year | 2015 | 2020 | 2015 | 2020 |
| Countrywide | 3% | 22% | 7 Days | 21 Days |
| BTH | 13% | 97% | 20 Days | 63 Days |
| FWP | 0% | 23% | 2 Days | 23 Days |
| YRD | 3% | 23% | 11 Days | 27 Days |
| SCB | 4% | 9% | 4 Days | 14 Days |
| PRD | 1% | 5% | 7 Days | 20 Days |