Air Pollution in San Wai Tsai: 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 | 29 (Good) | 32 (Good) | 28 (Good) | 29 (Good) | 33 (Good) | 44 (Moderate) | 38 (Good) | 41 (Moderate) | 40 (Good) | 31 (Good) | 28 (Good) | 31 (Good) | 28 (Good) | 35 (Good) | 34 (Good) | 30 (Good) | 50 (Moderate) | 37 (Good) | 36 (Good) | 44 (Moderate) | 33 (Good) | 36 (Good) | 26 (Good) | 30 (Good) | 30 (Good) | 35 (Good) | 37 (Good) | 47 (Moderate) | 43 (Moderate) |
| o3 | 42 (Good) | 70 (Moderate) | 62 (Good) | 56 (Good) | 63 (Good) | 61 (Good) | 85 (Moderate) | 90 (Moderate) | 83 (Moderate) | 55 (Good) | 39 (Good) | 37 (Good) | 63 (Good) | 55 (Good) | 62 (Good) | 52 (Good) | 52 (Good) | 39 (Good) | 64 (Good) | 82 (Moderate) | 50 (Good) | 51 (Good) | 31 (Good) | 34 (Good) | 29 (Good) | 48 (Good) | 71 (Moderate) | 54 (Good) | 54 (Good) |
| so2 | 3.4 (Good) | 3 (Good) | 2.4 (Good) | 2.4 (Good) | 3.2 (Good) | 6.1 (Good) | 5.8 (Good) | 5.5 (Good) | 7.5 (Good) | 4.3 (Good) | 4.7 (Good) | 4.1 (Good) | 2.8 (Good) | 2.4 (Good) | 2.4 (Good) | 1.8 (Good) | 2.9 (Good) | 3.1 (Good) | 1.8 (Good) | 3.7 (Good) | 3.3 (Good) | 2.5 (Good) | 2.4 (Good) | 2 (Good) | 2.5 (Good) | 1.9 (Good) | 1.8 (Good) | 2 (Good) | 1.9 (Good) |
| pm10 | 16 (Good) | 27 (Moderate) | 27 (Moderate) | 23 (Moderate) | 29 (Moderate) | 41 (Moderate) | 44 (Moderate) | 39 (Moderate) | 32 (Moderate) | 22 (Moderate) | 20 (Good) | 14 (Good) | 23 (Moderate) | 25 (Moderate) | 28 (Moderate) | 29 (Moderate) | 51 (Unhealthy for Sensitive Groups) | 35 (Moderate) | 33 (Moderate) | 39 (Moderate) | 31 (Moderate) | 24 (Moderate) | 15 (Good) | 19 (Good) | 19 (Good) | 39 (Moderate) | 33 (Moderate) | 43 (Moderate) | 38 (Moderate) |
| pm25 | 11 (Good) | 18 (Moderate) | 17 (Moderate) | 15 (Moderate) | 20 (Moderate) | 27 (Moderate) | 28 (Moderate) | 28 (Moderate) | 22 (Moderate) | 15 (Moderate) | 12 (Good) | 8.8 (Good) | 15 (Moderate) | 19 (Moderate) | 19 (Moderate) | 19 (Moderate) | 33 (Moderate) | 19 (Moderate) | 21 (Moderate) | 25 (Moderate) | 20 (Moderate) | 17 (Moderate) | 8.6 (Good) | 12 (Good) | 12 (Good) | 23 (Moderate) | 21 (Moderate) | 30 (Moderate) | 26 (Moderate) |
Tai Po
| 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 | 29 | 32 | 28 | 29 | 33 | 44 | 38 | 41 | 40 | 31 | 28 | 31 | 28 | 35 | 34 | 30 | 50 | 37 | 36 | 44 | 33 | 36 | 26 | 30 | 30 | 35 | 37 | 47 | 43 |
| o3 | 42 | 70 | 62 | 56 | 63 | 61 | 85 | 90 | 83 | 55 | 39 | 37 | 63 | 55 | 62 | 52 | 52 | 39 | 64 | 82 | 50 | 51 | 31 | 34 | 29 | 48 | 71 | 54 | 54 |
| so2 | 3.4 | 3 | 2.4 | 2.4 | 3.2 | 6.1 | 5.8 | 5.5 | 7.5 | 4.3 | 4.7 | 4.1 | 2.8 | 2.4 | 2.4 | 1.8 | 2.9 | 3.1 | 1.8 | 3.7 | 3.3 | 2.5 | 2.4 | 2 | 2.5 | 1.9 | 1.8 | 2 | 1.9 |
| pm10 | 16 | 27 | 27 | 23 | 29 | 41 | 44 | 39 | 32 | 22 | 20 | 14 | 23 | 25 | 28 | 29 | 51 | 35 | 33 | 39 | 31 | 24 | 15 | 19 | 19 | 39 | 33 | 43 | 38 |
| pm25 | 11 | 18 | 17 | 15 | 20 | 27 | 28 | 28 | 22 | 15 | 12 | 8.8 | 15 | 19 | 19 | 19 | 33 | 19 | 21 | 25 | 20 | 17 | 8.6 | 12 | 12 | 23 | 21 | 30 | 26 |
* Pollution data source:
https://openaq.org
(Hong Kong)
The data is licensed under CC-By 4.0