Air Pollution in Tsuen Wan District: Real-time Air Quality Index and smog alert.
| index | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 31 (Good) | 39 (Good) | 38 (Good) | 37 (Good) | 47 (Moderate) | 65 (Moderate) | 58 (Moderate) | 36 (Good) | 35 (Good) | 36 (Good) | 32 (Good) | 35 (Good) | 41 (Moderate) | 44 (Moderate) | 52 (Moderate) | 50 (Moderate) | 72 (Moderate) | 49 (Moderate) | 45 (Moderate) | 46 (Moderate) | 39 (Good) | 43 (Moderate) | 28 (Good) | 32 (Good) | 34 (Good) | 45 (Moderate) | 52 (Moderate) | 65 (Moderate) | 61 (Moderate) |
| o3 | 26 (Good) | 58 (Good) | 47 (Good) | 46 (Good) | 46 (Good) | 42 (Good) | 65 (Good) | 84 (Moderate) | 76 (Moderate) | 43 (Good) | 29 (Good) | 27 (Good) | 51 (Good) | 41 (Good) | 48 (Good) | 38 (Good) | 39 (Good) | 32 (Good) | 54 (Good) | 80 (Moderate) | 41 (Good) | 40 (Good) | 25 (Good) | 45 (Good) | 35 (Good) | 48 (Good) | 55 (Good) | 39 (Good) | 42 (Good) |
| so2 | 5.6 (Good) | 5.7 (Good) | 5 (Good) | 5.1 (Good) | 4.1 (Good) | 3.7 (Good) | 4.3 (Good) | 7.7 (Good) | 8.3 (Good) | 7.6 (Good) | 7.3 (Good) | 7.5 (Good) | 7.5 (Good) | 7.5 (Good) | 7 (Good) | 6.6 (Good) | 9.1 (Good) | 7.7 (Good) | 7.2 (Good) | 7.8 (Good) | 8.5 (Good) | 7.2 (Good) | 6.3 (Good) | 6.1 (Good) | 7.9 (Good) | 6.9 (Good) | 7 (Good) | 9.8 (Good) | 14 (Good) |
| co | 330 (Good) | 624 (Good) | 677 (Good) | 679 (Good) | 774 (Good) | 795 (Good) | 717 (Good) | 518 (Good) | 428 (Good) | 440 (Good) | 394 (Good) | 422 (Good) | 575 (Good) | 676 (Good) | 797 (Good) | 808 (Good) | 866 (Good) | 680 (Good) | 595 (Good) | 609 (Good) | 402 (Good) | 519 (Good) | 452 (Good) | 457 (Good) | 454 (Good) | 569 (Good) | 830 (Good) | 899 (Good) | 742 (Good) |
| pm10 | 16 (Good) | 25 (Moderate) | 25 (Moderate) | 24 (Moderate) | 28 (Moderate) | 39 (Moderate) | 45 (Moderate) | 38 (Moderate) | 31 (Moderate) | 23 (Moderate) | 21 (Moderate) | 15 (Good) | 22 (Moderate) | 23 (Moderate) | 26 (Moderate) | 24 (Moderate) | 47 (Moderate) | 28 (Moderate) | 34 (Moderate) | 39 (Moderate) | 29 (Moderate) | 24 (Moderate) | 14 (Good) | 17 (Good) | 19 (Good) | 37 (Moderate) | 33 (Moderate) | 43 (Moderate) | 39 (Moderate) |
| pm25 | 9.8 (Good) | 17 (Moderate) | 16 (Moderate) | 16 (Moderate) | 20 (Moderate) | 26 (Moderate) | 27 (Moderate) | 25 (Moderate) | 20 (Moderate) | 15 (Moderate) | 13 (Good) | 9.3 (Good) | 14 (Moderate) | 17 (Moderate) | 18 (Moderate) | 17 (Moderate) | 34 (Moderate) | 21 (Moderate) | 24 (Moderate) | 25 (Moderate) | 20 (Moderate) | 18 (Moderate) | 7.3 (Good) | 10 (Good) | 12 (Good) | 22 (Moderate) | 21 (Moderate) | 31 (Moderate) | 27 (Moderate) |
Tsuen Wan
| index | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| no2 | 31 | 39 | 38 | 37 | 47 | 65 | 58 | 36 | 35 | 36 | 32 | 35 | 41 | 44 | 52 | 50 | 72 | 49 | 45 | 46 | 39 | 43 | 28 | 32 | 34 | 45 | 52 | 65 | 61 |
| o3 | 26 | 58 | 47 | 46 | 46 | 42 | 65 | 84 | 76 | 43 | 29 | 27 | 51 | 41 | 48 | 38 | 39 | 32 | 54 | 80 | 41 | 40 | 25 | 45 | 35 | 48 | 55 | 39 | 42 |
| so2 | 5.6 | 5.7 | 5 | 5.1 | 4.1 | 3.7 | 4.3 | 7.7 | 8.3 | 7.6 | 7.3 | 7.5 | 7.5 | 7.5 | 7 | 6.6 | 9.1 | 7.7 | 7.2 | 7.8 | 8.5 | 7.2 | 6.3 | 6.1 | 7.9 | 6.9 | 7 | 9.8 | 14 |
| pm10 | 16 | 25 | 25 | 24 | 28 | 39 | 45 | 38 | 31 | 23 | 21 | 15 | 22 | 23 | 26 | 24 | 47 | 28 | 34 | 39 | 29 | 24 | 14 | 17 | 19 | 37 | 33 | 43 | 39 |
| pm25 | 9.8 | 17 | 16 | 16 | 20 | 26 | 27 | 25 | 20 | 15 | 13 | 9.3 | 14 | 17 | 18 | 17 | 34 | 21 | 24 | 25 | 20 | 18 | 7.3 | 10 | 12 | 22 | 21 | 31 | 27 |
| co | 330 | 624 | 677 | 679 | 774 | 795 | 717 | 518 | 428 | 440 | 394 | 422 | 575 | 676 | 797 | 808 | 866 | 680 | 595 | 609 | 402 | 519 | 452 | 457 | 454 | 569 | 830 | 899 | 742 |
* Pollution data source:
https://openaq.org
(Hong Kong)
The data is licensed under CC-By 4.0