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: 2021-09-16 22:00

StationPollutant Concentration (microgram/m3)/AQIAQHIAQI
NO2O3SO2COPM10PM2.5
Central/Western51.3/2559.3/255.6/3/-10.6/97.6/31431
Kwun Tong94.4/4721.2/94.2/2/-20.9/1910/41447
Tai Po39.2/1955.5/233.4/1/-8.1/76.4/26326
Tung Chung20.4/1044/195.9/3339/39.1/86.5/27327
Eastern47.8/2365.3/281.4/0/-17.8/1611.6/48448
Sha Tin37.8/1855/238.5/4/-10.3/97.6/31431
Tseung Kwan O94.4/4712.1/52.4/1743.1/738.5/3527/82482
Tap Mun15.4/774.1/326.6/3507.9/56.4/55.9/24432
Yuen Long69.3/3428.1/1210/5788.8/717/1512.2/51451
Tuen Mun62.8/3118.8/85.1/2717/718.7/1714.7/56356
Kwai Chung67.2/3333.7/143/1/-11.7/109.2/38438
Sham Shui Po97.4/4816.5/76.3/3/-14/127.3/30448
Tsuen Wan53.3/2637.8/164.2/2465.5/410.1/98.5/35335
Causeway Bay108.5/547.2/38.3/41001.9/932.5/3021.9/71471
Central111.8/5610.3/44.4/21090.3/1018.9/1714.1/55456
Mong Kok106.4/539.5/45.4/2721.3/716.9/1512.1/51453

* 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