PM2.5 | | | | | | | | | 2018 PM2.5 39 | / 43 / | 4 2019 | | PM2.5 | 11 | | 2018 6 8 PM2.5 | | | | | | | | | | | | | | | | | | | APP | | | | | | | | | | | | | | 2018 8 | 2000 | | | | | | | | | | | | | | | | | | | | | | 3 4 | | | | | | | | | | | 1000 | | | 80% | | | | 2018 | | 19 | 8 | | | | 30 | | | | | | | 2000 | | | | | | | | | | | | | | | | | | | | | 2019 | | |