Table 2.
Number of cases of acute exacerbation of AECOPD advanced by PM2.5 pollution above the expected rates if daily PM2.5 concentrations had not exceeded the standard 24-h targets each year.
| Item | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|---|---|---|
| WHO 24-h target (25 μg/m3) | ||||||||
| Number of days target not attained | 357 | 333 | 309 | 299 | 264 | 272 | 244 | 265 |
| Number of cases | 8,183 | 8,236 | 8,559 | 6,485 | 4,772 | 3,224 | 3,921 | 5,146 |
| Chinese grade I 24-h target (35 μg/m3) | ||||||||
| Number of days target not attained | 316 | 278 | 240 | 231 | 175 | 183 | 185 | 188 |
| Number of cases | 7,360 | 7,142 | 7,006 | 5,028 | 3,088 | 2,158 | 3,175 | 3,730 |
| Chinese grade II 24-h target (75 μg/m3) | ||||||||
| Number of days target not attained | 142 | 116 | 87 | 82 | 53 | 59 | 58 | 56 |
| Number of cases | 3,760 | 3,609 | 3,145 | 2,064 | 805 | 640 | 1,057 | 1,056 |