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Effects of implementing emission reduction measures of four, three, two, one and zero days before the start of red alerts on the reduction of PM2.5 concentrations.
| Emission scenarios (Reduction measures implemented) | PM2.5 peaks (%) | Daily averaged PM2.5 concentration (%) | ||||||
|---|---|---|---|---|---|---|---|---|
| YF | JCZX | DL | Average | YF | JCZX | DL | Average | |
| 4 days | 37 | 40 | 38 | 38 | 25 | 22 | 23 | 23 |
| 3 days | 36 | 38 | 34 | 36 | 23 | 20 | 22 | 22 |
| 2 days | 33 | 32 | 29 | 31 | 20 | 18 | 20 | 19 |
| 1 day | 27 | 26 | 22 | 25 | 19 | 16 | 19 | 18 |
| 0 day | 16 | 15 | 12 | 14 | 7 | 6 | 7 | 7 |
