Past 24 Hours Pollutant Concentration Summary
Central/Western
| Date Time | NO2 | O3 | SO2 | CO | PM10 | PM2.5 |
|---|---|---|---|---|---|---|
| 2021-05-18 15:00 | 19.1 | 42.7 | 7.8 | - | 12.5 | 7.8 |
| 2021-05-18 14:00 | 16.7 | 50.6 | 7.1 | - | 10.4 | 7.4 |
| 2021-05-18 13:00 | 17.9 | 47.2 | 7.2 | - | 12.0 | 8.3 |
| 2021-05-18 12:00 | 16.8 | 49.6 | 7.9 | - | 14.6 | 9.4 |
| 2021-05-18 11:00 | 19.1 | 43.6 | 8.3 | - | 9.5 | 5.5 |
| 2021-05-18 10:00 | 7.0 | 46.5 | 7.3 | - | 4.7 | 2.6 |
| 2021-05-18 09:00 | 12.0 | 37.0 | 7.6 | - | 6.1 | 4.1 |
| 2021-05-18 08:00 | 17.3 | 31.7 | 7.6 | - | 6.6 | 4.7 |
| 2021-05-18 07:00 | 19.4 | 27.2 | 8.2 | - | 7.8 | 6.1 |
| 2021-05-18 06:00 | 19.7 | 27.0 | 8.1 | - | 7.7 | 5.7 |
| 2021-05-18 05:00 | 14.0 | 29.2 | 8.3 | - | 8.3 | 6.0 |
| 2021-05-18 04:00 | - | 26.9 | - | - | 7.4 | 4.8 |
| 2021-05-18 03:00 | 19.9 | 25.3 | 8.0 | - | 8.5 | 6.5 |
| 2021-05-18 02:00 | 16.3 | 24.4 | 7.3 | - | 9.1 | 6.4 |
| 2021-05-18 01:00 | 18.0 | 25.1 | 7.7 | - | 10.0 | 7.6 |
| 2021-05-18 00:00 | 23.8 | 20.5 | 8.1 | - | 8.6 | 5.5 |
| 2021-05-17 23:00 | 17.2 | 29.0 | 7.2 | - | 9.5 | 7.2 |
| 2021-05-17 22:00 | 18.0 | 27.0 | 7.0 | - | 7.9 | 5.5 |
| 2021-05-17 21:00 | 12.3 | 30.1 | 6.2 | - | 8.7 | 5.8 |
| 2021-05-17 20:00 | 12.5 | 32.8 | 6.1 | - | 10.6 | 7.6 |
| 2021-05-17 19:00 | 15.5 | 29.6 | 6.5 | - | 10.7 | 8.0 |
| 2021-05-17 18:00 | 16.7 | 32.0 | 6.5 | - | 10.5 | 6.8 |
| 2021-05-17 17:00 | 16.9 | 42.0 | 7.0 | - | 11.9 | 8.0 |
| 2021-05-17 16:00 | 17.2 | 49.3 | 7.4 | - | 13.6 | 8.8 |
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.