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Since the Air Quality Health Index (AQHI) issued by Hong Kong Environmental
Protection Department is not comparable to other regions in the world, Weather Underground of Hong Kong
refers to the Air Quality Index (AQI) issued by U.S.
Environmental Protection Agency and calculates the Air Quality Index based on air pollutant concentration data
issued by Hong Kong Environmenal Protection Department.
Reference Links:
Time: 07 Apr 2025 22:00:00
| Station | Pollutant Concentration (microgram/m3)/AQI | AQHI | AQI |
| NO2 | O3 | SO2 | CO | PM10 | PM2.5 |
| Central/Western | 29.0/14 | 151.8/104 | 1.6/0 | -/- | 60.9/53 | 30.2
/89 | 6 | 104 |
| Kwun Tong | 57.5/28 | 129.3/70 | 1.3/0 | -/- | 56.1/51 | 27.8
/84 | 6 | 84 |
| Tai Po | 23.8/11 | 174.7/134 | 3.8/2 | -/- | 50.7/46 | 27.6
/83 | 6 | 134 |
| Tung Chung | 51.3/25 | 68.1/29 | 4.4/2 | 385.3/3 | 32.4/30 | 21.8
/71 | 5 | 71 |
| Eastern | 37.9/19 | 154.3/107 | 2.5/1 | -/- | 59.7/53 | 31.0
/90 | 7 | 107 |
| Sha Tin | 40.2/20 | 124.7/62 | 3.0/1 | -/- | 48.2/44 | 25.6
/79 | 6 | 79 |
| Tseung Kwan O | 30.4/15 | 151.3/103 | 5.3/2 | 356.5/3 | 59.3/53 | 28.2
/84 | 7 | 103 |
| Tap Mun | 5.6/2 | 100.0/43 | 1.9/1 | 316.5/3 | 34.2/31 | 21.4
/70 | 5 | 70 |
| Yuen Long | 71.8/36 | 85.2/36 | 2.7/1 | 1188.9/11 | 40.7/37 | 23.1
/74 | 5 | 74 |
| Tuen Mun | 58.7/29 | 108.9/47 | 7.1/3 | 576.8/5 | 66.2/56 | 34.2
/97 | 6 | 97 |
| Kwai Chung | 36.5/18 | 126.2/65 | .8/0 | -/- | 45.1/41 | 24.9
/77 | 5 | 77 |
| Sham Shui Po | 46.0/23 | 122.3/58 | 4.8/2 | -/- | 59.9/53 | 31.8
/92 | 6 | 92 |
| Tsuen Wan | 55.8/27 | 80.1/34 | 2.1/1 | 865.1/8 | 37.7/34 | 24.7
/77 | 5 | 77 |
| Causeway Bay | 56.0/28 | 113.2/48 | 2.1/1 | 513.2/5 | 73.0/59 | 37.7
/106 | 6 | 106 |
| Central | 77.8/39 | 102.9/44 | 1.9/1 | 725.6/7 | 61.2/54 | 36.3
/102 | 6 | 102 |
| Mong Kok | 91.3/45 | 94.7/40 | 2.9/1 | 540.6/5 | 68.2/57 | 38.0
/107 | 7 | 107 |
* Missing PM2.5 data from Environmental Protection Department
| Air Quality Index (AQI) | Category | Meaning |
| 0-50 | Good | Air pollution risk is low. |
| 51-100 | Moderate | Air quality is acceptable. |
| 101-150 | Unhealthy for high-risk group | High-risk group may have health effects. General public is not affected. |
| 151-200 | Unhealthy | High-risk group may have more serious health effects. Some of the general public may have health effects. |
| 201-300 | Very Unhealthy | General public have health effects. |
| 301-500 | Hazardous | Some of the general public may have more serious health effects. |
| Air Quality Health Index (AQHI) | Health Risk |
| 1-3 | Low |
| 4-6 | Moderate |
| 7 | High |
| 8-10 | Very high |
| 10+ | Serious |
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