Skip to content
    • 08:00 2026-01-28
      Current Health Risk Level
      General Stations:
      lowTomoderate
    • 08:00 2026-01-28
      Current Health Risk Level
      Roadside Stations:
      moderate
    • 08:00 2026-01-28
      Forecast of Health Risk Level (Today A.M.)
      General Stations
      lowTomoderate
      Roadside Stations
      lowTomoderate
    • 08:00 2026-01-28
      Forecast of Health Risk Level (Today P.M.)
      General Stations
      moderateTohigh
      Roadside Stations
      moderateTohigh
    • Health Advice
      The AQHI informs you of the short-term health risk of air pollution and helps you take precautionary measures to protect your health. The AQHIs are reported on a scale of 1 to 10 and 10+ and are grouped into five health risk categories: low, moderate, high, very high, and serious. The AQHI system provides different health advice for people having different degree of susceptibility to air pollution. For details, please visit the Health Advice of the AQHI website.
    • AQHI Forecast Alert
      The winds in Hong Kong are expected to be occasionally weak in the afternoon over the next two days, which is unfavourable for the dispersion of pollutants in the region, leading to an increase in pollution levels. The Health Risk Category at some monitoring stations may reach High or above today (27 Jan) and tomorrow. (Issued on 27 Jan PM)
    1. Go to slide 1
    2. Go to slide 2
    3. Go to slide 3
    4. Go to slide 4
    5. Go to slide 5
    6. Go to slide 6
    Play
    Past 24-Hour Air Quality Summary
    Central / Western (General Stations)
    Central / Western (General Stations)
    Southern (General Stations)
    Eastern (General Stations)
    Kwun Tong (General Stations)
    Sham Shui Po (General Stations)
    Kwai Chung (General Stations)
    Tsuen Wan (General Stations)
    Tseung Kwan O (General Stations)
    Yuen Long (General Stations)
    Tuen Mun (General Stations)
    Tung Chung (General Stations)
    Tai Po (General Stations)
    Sha Tin (General Stations)
    North (General Stations)
    Tap Mun (General Stations)
    Causeway Bay (Roadside Stations)
    Central (Roadside Stations)
    Mong Kok (Roadside Stations)
    moderate
    Central / Western
    08:00 2026-01-28
    Current AQHI
    4
    Contribution of individual pollutants
    SO2
        0%
    NO2
        16%
    O3
        68%
    PM10
        15%
    Remarks
    1. Time shown is in Hong Kong time.
    2. Concentration shown is in microgram per cubic metre (µg/m3).
    3. Abbreviation:
      NO2 - nitrogen dioxide, O3 - ozone,
      SO2 - sulphur dioxide, CO - carbon monoxide,
      PM10 - respirable suspended particulates,
      PM2.5 - fine suspended particulates
    4. The AQHI information is based on real time data taken directly from EPD's Air Quality Monitoring Network.
    5. In case of equipment or station suspension due to repair and maintenance, the data collection for calculation of AQHI at station will be affected, the data of similar stations will then be adopted. Such AQHI will be shown with an asterisk.
    AQHI
    AQHI
    4
    AQHI
    1-Hour
    AQHI Summary
    Date TimeAQHI
    Jan 28 08:004
    Jan 28 07:004
    Jan 28 06:004
    Jan 28 05:004
    Jan 28 04:004
    Jan 28 03:004
    Jan 28 02:004
    Jan 28 01:004
    Jan 28 00:005
    Jan 27 23:005
    Jan 27 22:006
    Jan 27 21:007
    Jan 27 20:008
    Jan 27 19:008
    Jan 27 18:008
    Jan 27 17:008
    Jan 27 16:008
    Jan 27 15:008
    Jan 27 14:007
    Jan 27 13:006
    Jan 27 12:005
    Jan 27 11:004
    Jan 27 10:003
    Jan 27 09:003
    Date TimeJan 28 08:00
    AQHI4
    Date TimeJan 28 07:00
    AQHI4
    Date TimeJan 28 06:00
    AQHI4
    Date TimeJan 28 05:00
    AQHI4
    Date TimeJan 28 04:00
    AQHI4
    Date TimeJan 28 03:00
    AQHI4
    Date TimeJan 28 02:00
    AQHI4
    Date TimeJan 28 01:00
    AQHI4
    Date TimeJan 28 00:00
    AQHI5
    Date TimeJan 27 23:00
    AQHI5
    Date TimeJan 27 22:00
    AQHI6
    Date TimeJan 27 21:00
    AQHI7
    Date TimeJan 27 20:00
    AQHI8
    Date TimeJan 27 19:00
    AQHI8
    Date TimeJan 27 18:00
    AQHI8
    Date TimeJan 27 17:00
    AQHI8
    Date TimeJan 27 16:00
    AQHI8
    Date TimeJan 27 15:00
    AQHI8
    Date TimeJan 27 14:00
    AQHI7
    Date TimeJan 27 13:00
    AQHI6
    Date TimeJan 27 12:00
    AQHI5
    Date TimeJan 27 11:00
    AQHI4
    Date TimeJan 27 10:00
    AQHI3
    Date TimeJan 27 09:00
    AQHI3
    Health Risk type: low
    Health Risk type: moderate
    Health Risk type: high
    Health Risk type: very high
    Health Risk type: serious
    Please visit <What's AQHI>for more information.
    NO2
    NO2 concentration
    1-Hour
    NO2 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Jan 28 08:0034.8
    Jan 28 07:0021
    Jan 28 06:0012.2
    Jan 28 05:0010
    Jan 28 04:0011
    Jan 28 03:0011.7
    Jan 28 02:0016
    Jan 28 01:00-
    Jan 28 00:0020.2
    Jan 27 23:0030
    Jan 27 22:0037.4
    Jan 27 21:0051.1
    Jan 27 20:00168.7
    Jan 27 19:00192.4
    Jan 27 18:00154.5
    Jan 27 17:00159.4
    Jan 27 16:00137.7
    Jan 27 15:00173.4
    Jan 27 14:00140
    Jan 27 13:00101.5
    Jan 27 12:0085.7
    Jan 27 11:0088
    Jan 27 10:0083.2
    Jan 27 09:0076.9
    Date TimeJan 28 08:00
    NO234.8
    Date TimeJan 28 07:00
    NO221
    Date TimeJan 28 06:00
    NO212.2
    Date TimeJan 28 05:00
    NO210
    Date TimeJan 28 04:00
    NO211
    Date TimeJan 28 03:00
    NO211.7
    Date TimeJan 28 02:00
    NO216
    Date TimeJan 28 01:00
    NO2-
    Date TimeJan 28 00:00
    NO220.2
    Date TimeJan 27 23:00
    NO230
    Date TimeJan 27 22:00
    NO237.4
    Date TimeJan 27 21:00
    NO251.1
    Date TimeJan 27 20:00
    NO2168.7
    Date TimeJan 27 19:00
    NO2192.4
    Date TimeJan 27 18:00
    NO2154.5
    Date TimeJan 27 17:00
    NO2159.4
    Date TimeJan 27 16:00
    NO2137.7
    Date TimeJan 27 15:00
    NO2173.4
    Date TimeJan 27 14:00
    NO2140
    Date TimeJan 27 13:00
    NO2101.5
    Date TimeJan 27 12:00
    NO285.7
    Date TimeJan 27 11:00
    NO288
    Date TimeJan 27 10:00
    NO283.2
    Date TimeJan 27 09:00
    NO276.9
    O3
    O3 concentration
    1-Hour
    O3 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Jan 28 08:0063.9
    Jan 28 07:0089
    Jan 28 06:00102.8
    Jan 28 05:00105.1
    Jan 28 04:0099.6
    Jan 28 03:00100.6
    Jan 28 02:00100.4
    Jan 28 01:00102.9
    Jan 28 00:0099.6
    Jan 27 23:0099.9
    Jan 27 22:00102.2
    Jan 27 21:00112.7
    Jan 27 20:0031.7
    Jan 27 19:0030.6
    Jan 27 18:0076.9
    Jan 27 17:0055.4
    Jan 27 16:0087.3
    Jan 27 15:0070.4
    Jan 27 14:0072.8
    Jan 27 13:0079.3
    Jan 27 12:0068.5
    Jan 27 11:0035.9
    Jan 27 10:0020.4
    Jan 27 09:0014.1
    Date TimeJan 28 08:00
    O363.9
    Date TimeJan 28 07:00
    O389
    Date TimeJan 28 06:00
    O3102.8
    Date TimeJan 28 05:00
    O3105.1
    Date TimeJan 28 04:00
    O399.6
    Date TimeJan 28 03:00
    O3100.6
    Date TimeJan 28 02:00
    O3100.4
    Date TimeJan 28 01:00
    O3102.9
    Date TimeJan 28 00:00
    O399.6
    Date TimeJan 27 23:00
    O399.9
    Date TimeJan 27 22:00
    O3102.2
    Date TimeJan 27 21:00
    O3112.7
    Date TimeJan 27 20:00
    O331.7
    Date TimeJan 27 19:00
    O330.6
    Date TimeJan 27 18:00
    O376.9
    Date TimeJan 27 17:00
    O355.4
    Date TimeJan 27 16:00
    O387.3
    Date TimeJan 27 15:00
    O370.4
    Date TimeJan 27 14:00
    O372.8
    Date TimeJan 27 13:00
    O379.3
    Date TimeJan 27 12:00
    O368.5
    Date TimeJan 27 11:00
    O335.9
    Date TimeJan 27 10:00
    O320.4
    Date TimeJan 27 09:00
    O314.1
    SO2
    SO2 concentration
    1-Hour
    SO2 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Jan 28 08:001.6
    Jan 28 07:001.7
    Jan 28 06:001.6
    Jan 28 05:001.7
    Jan 28 04:001.9
    Jan 28 03:002.2
    Jan 28 02:002.4
    Jan 28 01:00-
    Jan 28 00:002.1
    Jan 27 23:002.2
    Jan 27 22:002.8
    Jan 27 21:004.5
    Jan 27 20:0012.2
    Jan 27 19:007.5
    Jan 27 18:006.4
    Jan 27 17:007
    Jan 27 16:006.2
    Jan 27 15:007.7
    Jan 27 14:007.3
    Jan 27 13:006.6
    Jan 27 12:005.9
    Jan 27 11:006.5
    Jan 27 10:006
    Jan 27 09:005.2
    Date TimeJan 28 08:00
    SO21.6
    Date TimeJan 28 07:00
    SO21.7
    Date TimeJan 28 06:00
    SO21.6
    Date TimeJan 28 05:00
    SO21.7
    Date TimeJan 28 04:00
    SO21.9
    Date TimeJan 28 03:00
    SO22.2
    Date TimeJan 28 02:00
    SO22.4
    Date TimeJan 28 01:00
    SO2-
    Date TimeJan 28 00:00
    SO22.1
    Date TimeJan 27 23:00
    SO22.2
    Date TimeJan 27 22:00
    SO22.8
    Date TimeJan 27 21:00
    SO24.5
    Date TimeJan 27 20:00
    SO212.2
    Date TimeJan 27 19:00
    SO27.5
    Date TimeJan 27 18:00
    SO26.4
    Date TimeJan 27 17:00
    SO27
    Date TimeJan 27 16:00
    SO26.2
    Date TimeJan 27 15:00
    SO27.7
    Date TimeJan 27 14:00
    SO27.3
    Date TimeJan 27 13:00
    SO26.6
    Date TimeJan 27 12:00
    SO25.9
    Date TimeJan 27 11:00
    SO26.5
    Date TimeJan 27 10:00
    SO26
    Date TimeJan 27 09:00
    SO25.2
    PM10
    PM10 concentration
    1-Hour
    PM10 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Jan 28 08:0040.3
    Jan 28 07:0034.4
    Jan 28 06:0027.9
    Jan 28 05:0027.5
    Jan 28 04:0030
    Jan 28 03:0030
    Jan 28 02:0034.4
    Jan 28 01:0038.7
    Jan 28 00:0039.1
    Jan 27 23:0037.9
    Jan 27 22:0047.1
    Jan 27 21:0074.2
    Jan 27 20:0099.4
    Jan 27 19:0090.9
    Jan 27 18:0085
    Jan 27 17:0093.7
    Jan 27 16:00127.1
    Jan 27 15:00143.8
    Jan 27 14:00116.2
    Jan 27 13:0097.9
    Jan 27 12:0088.6
    Jan 27 11:0066
    Jan 27 10:0048.1
    Jan 27 09:0027.9
    Date TimeJan 28 08:00
    PM1040.3
    Date TimeJan 28 07:00
    PM1034.4
    Date TimeJan 28 06:00
    PM1027.9
    Date TimeJan 28 05:00
    PM1027.5
    Date TimeJan 28 04:00
    PM1030
    Date TimeJan 28 03:00
    PM1030
    Date TimeJan 28 02:00
    PM1034.4
    Date TimeJan 28 01:00
    PM1038.7
    Date TimeJan 28 00:00
    PM1039.1
    Date TimeJan 27 23:00
    PM1037.9
    Date TimeJan 27 22:00
    PM1047.1
    Date TimeJan 27 21:00
    PM1074.2
    Date TimeJan 27 20:00
    PM1099.4
    Date TimeJan 27 19:00
    PM1090.9
    Date TimeJan 27 18:00
    PM1085
    Date TimeJan 27 17:00
    PM1093.7
    Date TimeJan 27 16:00
    PM10127.1
    Date TimeJan 27 15:00
    PM10143.8
    Date TimeJan 27 14:00
    PM10116.2
    Date TimeJan 27 13:00
    PM1097.9
    Date TimeJan 27 12:00
    PM1088.6
    Date TimeJan 27 11:00
    PM1066
    Date TimeJan 27 10:00
    PM1048.1
    Date TimeJan 27 09:00
    PM1027.9
    PM2.5
    PM2.5 concentration
    1-Hour
    PM2.5 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Jan 28 08:0028.5
    Jan 28 07:0025
    Jan 28 06:0019.7
    Jan 28 05:0019.7
    Jan 28 04:0020.6
    Jan 28 03:0020.3
    Jan 28 02:0022.8
    Jan 28 01:0026.5
    Jan 28 00:0027.9
    Jan 27 23:0026.8
    Jan 27 22:0035.4
    Jan 27 21:0055.5
    Jan 27 20:0071
    Jan 27 19:0062.1
    Jan 27 18:0056.6
    Jan 27 17:0065
    Jan 27 16:0087.2
    Jan 27 15:0099.7
    Jan 27 14:0082.8
    Jan 27 13:0065.6
    Jan 27 12:0056
    Jan 27 11:0039.2
    Jan 27 10:0033.1
    Jan 27 09:0018.7
    Date TimeJan 28 08:00
    PM2.528.5
    Date TimeJan 28 07:00
    PM2.525
    Date TimeJan 28 06:00
    PM2.519.7
    Date TimeJan 28 05:00
    PM2.519.7
    Date TimeJan 28 04:00
    PM2.520.6
    Date TimeJan 28 03:00
    PM2.520.3
    Date TimeJan 28 02:00
    PM2.522.8
    Date TimeJan 28 01:00
    PM2.526.5
    Date TimeJan 28 00:00
    PM2.527.9
    Date TimeJan 27 23:00
    PM2.526.8
    Date TimeJan 27 22:00
    PM2.535.4
    Date TimeJan 27 21:00
    PM2.555.5
    Date TimeJan 27 20:00
    PM2.571
    Date TimeJan 27 19:00
    PM2.562.1
    Date TimeJan 27 18:00
    PM2.556.6
    Date TimeJan 27 17:00
    PM2.565
    Date TimeJan 27 16:00
    PM2.587.2
    Date TimeJan 27 15:00
    PM2.599.7
    Date TimeJan 27 14:00
    PM2.582.8
    Date TimeJan 27 13:00
    PM2.565.6
    Date TimeJan 27 12:00
    PM2.556
    Date TimeJan 27 11:00
    PM2.539.2
    Date TimeJan 27 10:00
    PM2.533.1
    Date TimeJan 27 09:00
    PM2.518.7
    Current Air Quality Summary by District
    Chart
    List
    AQHI
    Search
    4
    Central/Western
    4
    Southern
    3
    Eastern
    4
    Kwun Tong
    4
    Sham Shui Po
    4
    Kwai Chung
    3
    Tsuen Wan
    4
    Tseung Kwan O
    3
    Yuen Long
    4
    Tuen Mun
    2
    Tung Chung
    3
    Tai Po
    4
    Sha Tin
    3
    North
    3
    Tap Mun
    4
    Causeway Bay
    4
    Central
    4
    Mong Kok
    General Station
    Roadside Station
    Suspended
    Remarks
    1. Time shown is in Hong Kong time.
    2. Concentration shown is in microgram per cubic metre (µg/m3).
    3. Abbreviation:
      NO2 - nitrogen dioxide, O3 - ozone,
      SO2 - sulphur dioxide, CO - carbon monoxide,
      PM10 - respirable suspended particulates,
      PM2.5 - fine suspended particulates
    4. The Pollutant concentration and AQHI information are based on real time data taken directly from EPD's Air Quality Monitoring Network.
    5. In case of equipment or station suspension due to repair and maintenance, the data collection for calculation of AQHI at station will be affected, the data of similar stations will then be adopted. Such AQHI will be shown with an asterisk.
    (At January 28, 2026 08:00)
    General Stations
    Station NamesNO2O3SO2COPM10PM2.5AQHI
    Central/Western34.863.91.6-40.328.54
    Southern3171.13.4514.734.125.14
    Eastern3258.30.9-35.3193
    Kwun Tong63.630.13.2-38.822.64
    Sham Shui Po54.145.82.7-36.126.54
    Kwai Chung46.353.20.7-34.626.64
    Tsuen Wan50.439.30.7584.128.724.73
    Tseung Kwan O24.2664.7442.741.121.24
    Yuen Long39.244.20.8893.339.2293
    Tuen Mun60.449.13.5628.445.1344
    Tung Chung2436.92.4902.242.836.12
    Tai Po43.640.84-37233
    Sha Tin36.556.92.3-31.522.34
    North34.352.72.9694.431.620.73
    Tap Mun17.250.70.7640.140.428.93
    Roadside Stations
    Station NamesNO2O3SO2COPM10PM2.5AQHI
    Causeway Bay53.335.72.4644.741.328.84
    Central61.937.43.5393.942.628.44
    Mong Kok79.229.66605.441.228.24
    Station NamesCentral/Western(General Stations)
    NO234.8
    O363.9
    SO21.6
    CO-
    PM1040.3
    PM2.528.5
    AQHI4
    Station NamesSouthern(General Stations)
    NO231
    O371.1
    SO23.4
    CO514.7
    PM1034.1
    PM2.525.1
    AQHI4
    Station NamesEastern(General Stations)
    NO232
    O358.3
    SO20.9
    CO-
    PM1035.3
    PM2.519
    AQHI3
    Station NamesKwun Tong(General Stations)
    NO263.6
    O330.1
    SO23.2
    CO-
    PM1038.8
    PM2.522.6
    AQHI4
    Station NamesSham Shui Po(General Stations)
    NO254.1
    O345.8
    SO22.7
    CO-
    PM1036.1
    PM2.526.5
    AQHI4
    Station NamesKwai Chung(General Stations)
    NO246.3
    O353.2
    SO20.7
    CO-
    PM1034.6
    PM2.526.6
    AQHI4
    Station NamesTsuen Wan(General Stations)
    NO250.4
    O339.3
    SO20.7
    CO584.1
    PM1028.7
    PM2.524.7
    AQHI3
    Station NamesTseung Kwan O(General Stations)
    NO224.2
    O366
    SO24.7
    CO442.7
    PM1041.1
    PM2.521.2
    AQHI4
    Station NamesYuen Long(General Stations)
    NO239.2
    O344.2
    SO20.8
    CO893.3
    PM1039.2
    PM2.529
    AQHI3
    Station NamesTuen Mun(General Stations)
    NO260.4
    O349.1
    SO23.5
    CO628.4
    PM1045.1
    PM2.534
    AQHI4
    Station NamesTung Chung(General Stations)
    NO224
    O336.9
    SO22.4
    CO902.2
    PM1042.8
    PM2.536.1
    AQHI2
    Station NamesTai Po(General Stations)
    NO243.6
    O340.8
    SO24
    CO-
    PM1037
    PM2.523
    AQHI3
    Station NamesSha Tin(General Stations)
    NO236.5
    O356.9
    SO22.3
    CO-
    PM1031.5
    PM2.522.3
    AQHI4
    Station NamesNorth(General Stations)
    NO234.3
    O352.7
    SO22.9
    CO694.4
    PM1031.6
    PM2.520.7
    AQHI3
    Station NamesTap Mun(General Stations)
    NO217.2
    O350.7
    SO20.7
    CO640.1
    PM1040.4
    PM2.528.9
    AQHI3
    Station NamesCauseway Bay(Roadside Stations)
    NO253.3
    O335.7
    SO22.4
    CO644.7
    PM1041.3
    PM2.528.8
    AQHI4
    Station NamesCentral(Roadside Stations)
    NO261.9
    O337.4
    SO23.5
    CO393.9
    PM1042.6
    PM2.528.4
    AQHI4
    Station NamesMong Kok(Roadside Stations)
    NO279.2
    O329.6
    SO26
    CO605.4
    PM1041.2
    PM2.528.2
    AQHI4
    AQHI QR CodeEPD AQHI : Past 24-Hour Air Quality Summary