Air Quality in Hong Kong


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.

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Time: 22 Jul 2025 14:00:00

StationPollutant Concentration (microgram/m3)/AQIAQHIAQI
NO2O3SO2COPM10PM2.5
Central/Western25.0/1236.6/153.8/2-/-16.3/154.7 /19219
Kwun Tong35.2/1740.4/172.9/1-/-20.8/199.2 /38338
Tai Po20.4/1049.0/213.3/1-/-17.0/156.5 /27327
Tung Chung7.4/362.4/261.1/0275.5/221.0/1911.6 /48348
Eastern34.5/1748.3/201.3/0-/-25.3/2310.7 /44344
Sha Tin13.1/663.7/27.6/0-/-14.5/135.6 /23327
Tseung Kwan O11.7/562.8/274.6/2166.4/118.9/178.7 /36336
Tap Mun4.1/268.4/29.1/0398.1/314.4/135.9 /24329
Yuen Long-/--/--/--/-19.3/178.6 /35335
Tuen Mun27.6/1337.3/164.9/2510.5/525.2/237.1 /29329
Kwai Chung28.3/1441.6/174.2/2-/-22.4/209.3 /38338
Sham Shui Po40.6/2036.2/156.1/3-/-26.3/2411.4 /47347
Tsuen Wan23.3/1140.8/171.3/0290.5/217.4/167.9 /32232
Causeway Bay56.0/2823.1/94.4/2293.9/241.2/3821.3 /70370
Central51.9/2625.8/114.7/2572.6/538.7/3525.3 /78378
Mong Kok65.9/3323.9/102.6/1406.4/432.9/3015.1 /57357

* Missing PM2.5 data from Environmental Protection Department

Air Quality Index (AQI)CategoryMeaning
0-50GoodAir pollution risk is low.
51-100ModerateAir quality is acceptable.
101-150Unhealthy for high-risk groupHigh-risk group may have health effects. General public is not affected.
151-200UnhealthyHigh-risk group may have more serious health effects. Some of the general public may have health effects.
201-300Very UnhealthyGeneral public have health effects.
301-500HazardousSome of the general public may have more serious health effects.

Air Quality Health Index (AQHI)Health Risk
1-3Low
4-6Moderate
7High
8-10Very high
10+Serious