Central/Western
| Date Time | NO2 | O3 | SO2 | CO | PM10 | PM2.5 |
|---|---|---|---|---|---|---|
| 2021-09-21 21:00 | 75.7 | 1.4 | 6.9 | - | 16.3 | 11.4 |
| 2021-09-21 20:00 | 78.5 | 2.1 | 6.8 | - | 18.9 | 10.6 |
| 2021-09-21 19:00 | 80.9 | 2.3 | 7.2 | - | 14.0 | 7.3 |
| 2021-09-21 18:00 | 75.9 | 5.7 | 7.5 | - | 18.9 | 11.4 |
| 2021-09-21 17:00 | 79.8 | 9.1 | 6.2 | - | 19.9 | 11.5 |
| 2021-09-21 16:00 | 72.6 | 10.7 | 8.3 | - | 14.0 | 7.2 |
| 2021-09-21 15:00 | 54.0 | 18.5 | 6.3 | - | 8.1 | 5.5 |
| 2021-09-21 14:00 | 33.4 | 38.6 | 2.8 | - | 6.9 | 5.3 |
| 2021-09-21 13:00 | 22.7 | 43.0 | 3.2 | - | 10.3 | 6.5 |
| 2021-09-21 12:00 | 40.3 | 13.5 | 6.0 | - | 14.8 | 8.4 |
| 2021-09-21 11:00 | 41.6 | 6.6 | 6.0 | - | 13.3 | 9.2 |
| 2021-09-21 10:00 | 39.3 | 7.5 | 5.5 | - | 11.1 | 8.2 |
| 2021-09-21 09:00 | 34.7 | 7.7 | 5.4 | - | 11.8 | 8.8 |
| 2021-09-21 08:00 | 35.6 | 5.9 | 6.9 | - | 11.3 | 7.8 |
| 2021-09-21 07:00 | 37.9 | 1.9 | 9.6 | - | 11.3 | 8.3 |
| 2021-09-21 06:00 | 43.3 | 1.0 | 9.9 | - | 10.5 | 7.8 |
| 2021-09-21 05:00 | 44.7 | 1.1 | 9.3 | - | 8.5 | 5.9 |
| 2021-09-21 04:00 | - | 16.7 | - | - | 7.3 | 5.4 |
| 2021-09-21 03:00 | 17.8 | 21.5 | 3.4 | - | 6.6 | 5.0 |
| 2021-09-21 02:00 | 21.7 | 17.6 | 3.3 | - | 2.7 | 1.2 |
| 2021-09-21 01:00 | 18.2 | 19.9 | 3.1 | - | 3.6 | 2.3 |
| 2021-09-21 00:00 | 23.1 | 14.1 | 3.3 | - | 5.8 | 4.3 |
| 2021-09-20 23:00 | 26.2 | 14.8 | 3.8 | - | 6.4 | 4.5 |
| 2021-09-20 22:00 | 24.7 | 21.4 | 4.0 | - | 5.6 | 3.9 |
Remarks:
(1) Time shown is in Hong Kong time.
(2) NO2 - nitrogen dioxide, O3 - ozone,
SO2 - sulphur dioxide, CO - carbon monoxide,
PM10 - respirable suspended particulates,
PM2.5 - fine suspended particulates
(3) Concentration shown is in µg/m3.
(4) The pollutant concentration is based on real time data taken directly from EPD's Air Quality Monitoring Network.
