Past 24 Hours Pollutant Concentration Summary
Central/Western
| Date Time | NO2 | O3 | SO2 | CO | PM10 | PM2.5 |
|---|---|---|---|---|---|---|
| 2021-09-22 18:00 | 21.6 | 45.6 | 2.3 | - | 6.1 | 4.1 |
| 2021-09-22 17:00 | 21.8 | 44.4 | 2.6 | - | 6.4 | 4.6 |
| 2021-09-22 16:00 | 15.5 | 46.7 | 2.3 | - | 6.7 | 5.1 |
| 2021-09-22 15:00 | 11.9 | 62.5 | 2.2 | - | 6.9 | 5.3 |
| 2021-09-22 14:00 | 15.0 | 57.4 | 2.3 | - | 5.2 | 4.1 |
| 2021-09-22 13:00 | 15.8 | 54.3 | 2.5 | - | 6.2 | 4.8 |
| 2021-09-22 12:00 | 16.3 | 45.5 | 2.5 | - | 3.4 | 2.2 |
| 2021-09-22 11:00 | 17.5 | 34.4 | 3.1 | - | 3.6 | 3.2 |
| 2021-09-22 10:00 | 15.7 | 29.2 | 2.8 | - | 5.6 | 4.8 |
| 2021-09-22 09:00 | 27.2 | 15.8 | 4.9 | - | 7.4 | 5.8 |
| 2021-09-22 08:00 | 40.7 | 5.0 | 10.0 | - | 7.8 | 6.3 |
| 2021-09-22 07:00 | 34.9 | 6.1 | 4.3 | - | 4.9 | 3.7 |
| 2021-09-22 06:00 | 36.3 | 5.4 | 4.1 | - | 4.3 | 3.6 |
| 2021-09-22 05:00 | 13.4 | 28.2 | 2.9 | - | 3.3 | 3.2 |
| 2021-09-22 04:00 | 10.6 | 31.7 | 3.0 | - | 3.7 | 3.4 |
| 2021-09-22 03:00 | 9.7 | 28.8 | 2.9 | - | 0.5 | - |
| 2021-09-22 02:00 | 11.2 | 27.6 | 3.1 | - | 2.3 | 2.1 |
| 2021-09-22 01:00 | 11.8 | 30.2 | 3.3 | - | 6.4 | 5.5 |
| 2021-09-22 00:00 | 37.6 | 23.6 | 5.0 | - | 9.7 | 6.7 |
| 2021-09-21 23:00 | 61.2 | 8.1 | 5.9 | - | 14.0 | 9.4 |
| 2021-09-21 22:00 | 77.2 | 0.9 | 7.6 | - | 15.6 | 10.6 |
| 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 |
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.