Air Pollution in Central and Western 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 | 61 (Moderate) | 74 (Moderate) | 69 (Moderate) | 69 (Moderate) | 79 (Moderate) | 94 (Moderate) | 89 (Moderate) | 91 (Moderate) | 97 (Moderate) | 74 (Moderate) | 64 (Moderate) | 65 (Moderate) | 70 (Moderate) | 72 (Moderate) | 78 (Moderate) | 68 (Moderate) | 96 (Moderate) | 76 (Moderate) | 83 (Moderate) | 104 (Unhealthy for Sensitive Groups) | 85 (Moderate) | 87 (Moderate) | 56 (Moderate) | 78 (Moderate) | 61 (Moderate) | 67 (Moderate) | 84 (Moderate) | 94 (Moderate) | 79 (Moderate) |
| o3 | 21 (Good) | 49 (Good) | 39 (Good) | 38 (Good) | 36 (Good) | 35 (Good) | 61 (Good) | 62 (Good) | 47 (Good) | 28 (Good) | 20 (Good) | 21 (Good) | 41 (Good) | 30 (Good) | 34 (Good) | 27 (Good) | 25 (Good) | 19 (Good) | 33 (Good) | 46 (Good) | 20 (Good) | 18 (Good) | 15 (Good) | 26 (Good) | 19 (Good) | 20 (Good) | 36 (Good) | 23 (Good) | 30 (Good) |
| so2 | 4.1 (Good) | 5.1 (Good) | 4.7 (Good) | 4.6 (Good) | 5.5 (Good) | 9.4 (Good) | 7.3 (Good) | 4.5 (Good) | 5.2 (Good) | 5.6 (Good) | 4.5 (Good) | 5.6 (Good) | 3.8 (Good) | 4.7 (Good) | 5.8 (Good) | 4.6 (Good) | 9.3 (Good) | 8.3 (Good) | 7.1 (Good) | 8.6 (Good) | 10 (Good) | 8.3 (Good) | 6.8 (Good) | 6.8 (Good) | 8.6 (Good) | 4.4 (Good) | 5.2 (Good) | 9.2 (Good) | 7.7 (Good) |
| co | 738 (Good) | 817 (Good) | 817 (Good) | 912 (Good) | 877 (Good) | 789 (Good) | 794 (Good) | 835 (Good) | 783 (Good) | 843 (Good) | 744 (Good) | 807 (Good) | 797 (Good) | 317 (Good) | 743 (Good) | 878 (Good) | 866 (Good) | 828 (Good) | 755 (Good) | 739 (Good) | 724 (Good) | 723 (Good) | 570 (Good) | 801 (Good) | 732 (Good) | 746 (Good) | 845 (Good) | 858 (Good) | 742 (Good) |
| pm10 | 20 (Moderate) | 33 (Moderate) | 35 (Moderate) | 33 (Moderate) | 37 (Moderate) | 46 (Moderate) | 52 (Unhealthy for Sensitive Groups) | 44 (Moderate) | 38 (Moderate) | 27 (Moderate) | 27 (Moderate) | 21 (Moderate) | 29 (Moderate) | 31 (Moderate) | 34 (Moderate) | 36 (Moderate) | 58 (Unhealthy for Sensitive Groups) | 43 (Moderate) | 38 (Moderate) | 38 (Moderate) | 30 (Moderate) | 24 (Moderate) | 13 (Good) | 17 (Good) | 19 (Good) | 43 (Moderate) | 39 (Moderate) | 47 (Moderate) | 39 (Moderate) |
| pm25 | 12 (Good) | 19 (Moderate) | 20 (Moderate) | 18 (Moderate) | 23 (Moderate) | 29 (Moderate) | 30 (Moderate) | 29 (Moderate) | 25 (Moderate) | 18 (Moderate) | 16 (Moderate) | 14 (Moderate) | 19 (Moderate) | 21 (Moderate) | 22 (Moderate) | 22 (Moderate) | 38 (Unhealthy for Sensitive Groups) | 26 (Moderate) | 23 (Moderate) | 25 (Moderate) | 22 (Moderate) | 18 (Moderate) | 6.8 (Good) | 11 (Good) | 11 (Good) | 25 (Moderate) | 24 (Moderate) | 32 (Moderate) | 25 (Moderate) |
Central
| 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 | 61 | 74 | 69 | 69 | 79 | 94 | 89 | 91 | 97 | 74 | 64 | 65 | 70 | 72 | 78 | 68 | 96 | 76 | 83 | 104 | 85 | 87 | 56 | 78 | 61 | 67 | 84 | 94 | 79 |
| o3 | 21 | 49 | 39 | 38 | 36 | 35 | 61 | 62 | 47 | 28 | 20 | 21 | 41 | 30 | 34 | 27 | 25 | 19 | 33 | 46 | 20 | 18 | 15 | 26 | 19 | 20 | 36 | 23 | 30 |
| so2 | 4.1 | 5.1 | 4.7 | 4.6 | 5.5 | 9.4 | 7.3 | 4.5 | 5.2 | 5.6 | 4.5 | 5.6 | 3.8 | 4.7 | 5.8 | 4.6 | 9.3 | 8.3 | 7.1 | 8.6 | 10 | 8.3 | 6.8 | 6.8 | 8.6 | 4.4 | 5.2 | 9.2 | 7.7 |
| pm10 | 20 | 33 | 35 | 33 | 37 | 46 | 52 | 44 | 38 | 27 | 27 | 21 | 29 | 31 | 34 | 36 | 58 | 43 | 38 | 38 | 30 | 24 | 13 | 17 | 19 | 43 | 39 | 47 | 39 |
| pm25 | 12 | 19 | 20 | 18 | 23 | 29 | 30 | 29 | 25 | 18 | 16 | 14 | 19 | 21 | 22 | 22 | 38 | 26 | 23 | 25 | 22 | 18 | 6.8 | 11 | 11 | 25 | 24 | 32 | 25 |
| co | 738 | 817 | 817 | 912 | 877 | 789 | 794 | 835 | 783 | 843 | 744 | 807 | 797 | 317 | 743 | 878 | 866 | 828 | 755 | 739 | 724 | 723 | 570 | 801 | 732 | 746 | 845 | 858 | 742 |
* Pollution data source:
https://openaq.org
(Hong Kong)
The data is licensed under CC-By 4.0