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: 2019-05-20 23:00

StationPollutant Concentration (microgram/m3)/AQIAQHIAQI
NO2O3SO2COPM10PM2.5
Central/Western104.9/528.5/35.6/3/-29/2622/71471
Kwun Tong46.9/2360.5/268.4/4/-28.1/2617/61461
Tai Po26.6/1355.8/242.5/1/-19.5/1814.8/56356
Tung Chung37.2/1854.1/236.3/3628/621.2/1912.5/51351
Eastern46.1/2345.3/190.7/0/-34.8/3219.9/67367
Sha Tin22.5/1183.2/351.4/0/-28.4/26-/-3-*
Tseung Kwan O28.7/1465/281.7/0384/328.6/2622.1/72372
Tap Mun21.8/1041.8/185.8/3442.2/424.4/2214.2/55355
Yuen Long30.1/1579.3/343/1404.8/439.1/3611.2/46446
Tuen Mun24/1284.9/367.2/3616.6/639.2/3622.4/72472
Kwai Chung41.5/2063.3/279.9/5/-30.5/2821.4/70470
Sham Shui Po49.5/2453.6/234.4/2/-33.4/3024.1/76476
Tsuen Wan26.8/1358.1/257.3/3619.8/623.6/2121.9/71371
Causeway Bay94.9/4712.2/511.7/6799.7/750.2/4638.8/1094109
Central103/5113.2/54/21160.4/1146.8/4328.2/84484
Mong Kok68.1/3436.6/152/1951.3/929/2623/73473

* 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