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    • 03:00 2026-02-24
      Current Health Risk Level
      General Stations:
      lowTomoderate
    • 03:00 2026-02-24
      Current Health Risk Level
      Roadside Stations:
      moderate
    • 03:00 2026-02-24
      Forecast of Health Risk Level (Today A.M.)
      General Stations
      lowTomoderate
      Roadside Stations
      lowTomoderate
    • 03:00 2026-02-24
      Forecast of Health Risk Level (Today P.M.)
      General Stations
      lowTomoderate
      Roadside Stations
      lowTomoderate
    • 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.
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    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
    03:00 2026-02-24
    Current AQHI
    4
    Contribution of individual pollutants
    SO2
        0%
    NO2
        8%
    O3
        70%
    PM10
        22%
    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
    Feb 24 03:004
    Feb 24 02:004
    Feb 24 01:004
    Feb 24 00:004
    Feb 23 23:004
    Feb 23 22:004
    Feb 23 21:005
    Feb 23 20:005
    Feb 23 19:005
    Feb 23 18:005
    Feb 23 17:005
    Feb 23 16:005
    Feb 23 15:005
    Feb 23 14:005
    Feb 23 13:005
    Feb 23 12:004
    Feb 23 11:004
    Feb 23 10:004
    Feb 23 09:004
    Feb 23 08:004
    Feb 23 07:003
    Feb 23 06:003
    Feb 23 05:003
    Feb 23 04:003
    Date TimeFeb 24 03:00
    AQHI4
    Date TimeFeb 24 02:00
    AQHI4
    Date TimeFeb 24 01:00
    AQHI4
    Date TimeFeb 24 00:00
    AQHI4
    Date TimeFeb 23 23:00
    AQHI4
    Date TimeFeb 23 22:00
    AQHI4
    Date TimeFeb 23 21:00
    AQHI5
    Date TimeFeb 23 20:00
    AQHI5
    Date TimeFeb 23 19:00
    AQHI5
    Date TimeFeb 23 18:00
    AQHI5
    Date TimeFeb 23 17:00
    AQHI5
    Date TimeFeb 23 16:00
    AQHI5
    Date TimeFeb 23 15:00
    AQHI5
    Date TimeFeb 23 14:00
    AQHI5
    Date TimeFeb 23 13:00
    AQHI5
    Date TimeFeb 23 12:00
    AQHI4
    Date TimeFeb 23 11:00
    AQHI4
    Date TimeFeb 23 10:00
    AQHI4
    Date TimeFeb 23 09:00
    AQHI4
    Date TimeFeb 23 08:00
    AQHI4
    Date TimeFeb 23 07:00
    AQHI3
    Date TimeFeb 23 06:00
    AQHI3
    Date TimeFeb 23 05:00
    AQHI3
    Date TimeFeb 23 04:00
    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)
    Feb 24 03:009.9
    Feb 24 02:009.8
    Feb 24 01:0015.3
    Feb 24 00:0020.2
    Feb 23 23:0029.7
    Feb 23 22:0024.9
    Feb 23 21:0033.2
    Feb 23 20:0054.5
    Feb 23 19:0034.8
    Feb 23 18:0030.2
    Feb 23 17:0033
    Feb 23 16:0030.9
    Feb 23 15:0032.1
    Feb 23 14:0027
    Feb 23 13:0022
    Feb 23 12:0025.6
    Feb 23 11:0026.5
    Feb 23 10:0030.4
    Feb 23 09:0036
    Feb 23 08:0027.3
    Feb 23 07:0021.6
    Feb 23 06:0018.6
    Feb 23 05:0044.4
    Feb 23 04:0074
    Date TimeFeb 24 03:00
    NO29.9
    Date TimeFeb 24 02:00
    NO29.8
    Date TimeFeb 24 01:00
    NO215.3
    Date TimeFeb 24 00:00
    NO220.2
    Date TimeFeb 23 23:00
    NO229.7
    Date TimeFeb 23 22:00
    NO224.9
    Date TimeFeb 23 21:00
    NO233.2
    Date TimeFeb 23 20:00
    NO254.5
    Date TimeFeb 23 19:00
    NO234.8
    Date TimeFeb 23 18:00
    NO230.2
    Date TimeFeb 23 17:00
    NO233
    Date TimeFeb 23 16:00
    NO230.9
    Date TimeFeb 23 15:00
    NO232.1
    Date TimeFeb 23 14:00
    NO227
    Date TimeFeb 23 13:00
    NO222
    Date TimeFeb 23 12:00
    NO225.6
    Date TimeFeb 23 11:00
    NO226.5
    Date TimeFeb 23 10:00
    NO230.4
    Date TimeFeb 23 09:00
    NO236
    Date TimeFeb 23 08:00
    NO227.3
    Date TimeFeb 23 07:00
    NO221.6
    Date TimeFeb 23 06:00
    NO218.6
    Date TimeFeb 23 05:00
    NO244.4
    Date TimeFeb 23 04:00
    NO274
    O3
    O3 concentration
    1-Hour
    O3 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Feb 24 03:0093.1
    Feb 24 02:0091.8
    Feb 24 01:0085.5
    Feb 24 00:0080.2
    Feb 23 23:0078.2
    Feb 23 22:0085.5
    Feb 23 21:0080.9
    Feb 23 20:0067.8
    Feb 23 19:0092.5
    Feb 23 18:00102.7
    Feb 23 17:00103.2
    Feb 23 16:00107.5
    Feb 23 15:00102.7
    Feb 23 14:00106.3
    Feb 23 13:00111.3
    Feb 23 12:00105.9
    Feb 23 11:0098.5
    Feb 23 10:0090.9
    Feb 23 09:0080.5
    Feb 23 08:0074.1
    Feb 23 07:0067.3
    Feb 23 06:0066.8
    Feb 23 05:0039.3
    Feb 23 04:0015.3
    Date TimeFeb 24 03:00
    O393.1
    Date TimeFeb 24 02:00
    O391.8
    Date TimeFeb 24 01:00
    O385.5
    Date TimeFeb 24 00:00
    O380.2
    Date TimeFeb 23 23:00
    O378.2
    Date TimeFeb 23 22:00
    O385.5
    Date TimeFeb 23 21:00
    O380.9
    Date TimeFeb 23 20:00
    O367.8
    Date TimeFeb 23 19:00
    O392.5
    Date TimeFeb 23 18:00
    O3102.7
    Date TimeFeb 23 17:00
    O3103.2
    Date TimeFeb 23 16:00
    O3107.5
    Date TimeFeb 23 15:00
    O3102.7
    Date TimeFeb 23 14:00
    O3106.3
    Date TimeFeb 23 13:00
    O3111.3
    Date TimeFeb 23 12:00
    O3105.9
    Date TimeFeb 23 11:00
    O398.5
    Date TimeFeb 23 10:00
    O390.9
    Date TimeFeb 23 09:00
    O380.5
    Date TimeFeb 23 08:00
    O374.1
    Date TimeFeb 23 07:00
    O367.3
    Date TimeFeb 23 06:00
    O366.8
    Date TimeFeb 23 05:00
    O339.3
    Date TimeFeb 23 04:00
    O315.3
    SO2
    SO2 concentration
    1-Hour
    SO2 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Feb 24 03:001.6
    Feb 24 02:001.6
    Feb 24 01:001.6
    Feb 24 00:001.7
    Feb 23 23:001.7
    Feb 23 22:001.6
    Feb 23 21:001.6
    Feb 23 20:001.6
    Feb 23 19:001.6
    Feb 23 18:001.7
    Feb 23 17:001.9
    Feb 23 16:002.1
    Feb 23 15:002
    Feb 23 14:002.4
    Feb 23 13:002.6
    Feb 23 12:003
    Feb 23 11:003.1
    Feb 23 10:003.4
    Feb 23 09:003.4
    Feb 23 08:003.1
    Feb 23 07:002.7
    Feb 23 06:003
    Feb 23 05:003.7
    Feb 23 04:003.8
    Date TimeFeb 24 03:00
    SO21.6
    Date TimeFeb 24 02:00
    SO21.6
    Date TimeFeb 24 01:00
    SO21.6
    Date TimeFeb 24 00:00
    SO21.7
    Date TimeFeb 23 23:00
    SO21.7
    Date TimeFeb 23 22:00
    SO21.6
    Date TimeFeb 23 21:00
    SO21.6
    Date TimeFeb 23 20:00
    SO21.6
    Date TimeFeb 23 19:00
    SO21.6
    Date TimeFeb 23 18:00
    SO21.7
    Date TimeFeb 23 17:00
    SO21.9
    Date TimeFeb 23 16:00
    SO22.1
    Date TimeFeb 23 15:00
    SO22
    Date TimeFeb 23 14:00
    SO22.4
    Date TimeFeb 23 13:00
    SO22.6
    Date TimeFeb 23 12:00
    SO23
    Date TimeFeb 23 11:00
    SO23.1
    Date TimeFeb 23 10:00
    SO23.4
    Date TimeFeb 23 09:00
    SO23.4
    Date TimeFeb 23 08:00
    SO23.1
    Date TimeFeb 23 07:00
    SO22.7
    Date TimeFeb 23 06:00
    SO23
    Date TimeFeb 23 05:00
    SO23.7
    Date TimeFeb 23 04:00
    SO23.8
    PM10
    PM10 concentration
    1-Hour
    PM10 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Feb 24 03:0057.7
    Feb 24 02:0048.8
    Feb 24 01:0039.7
    Feb 24 00:0046.1
    Feb 23 23:0051.7
    Feb 23 22:0049.8
    Feb 23 21:0065.4
    Feb 23 20:0072.1
    Feb 23 19:0072.1
    Feb 23 18:0060.9
    Feb 23 17:0049.8
    Feb 23 16:0041.6
    Feb 23 15:0041.9
    Feb 23 14:0039.3
    Feb 23 13:0039.3
    Feb 23 12:0036.9
    Feb 23 11:0038.4
    Feb 23 10:0042.3
    Feb 23 09:0038.9
    Feb 23 08:0037.6
    Feb 23 07:0037.7
    Feb 23 06:0042.5
    Feb 23 05:0040.6
    Feb 23 04:0027.1
    Date TimeFeb 24 03:00
    PM1057.7
    Date TimeFeb 24 02:00
    PM1048.8
    Date TimeFeb 24 01:00
    PM1039.7
    Date TimeFeb 24 00:00
    PM1046.1
    Date TimeFeb 23 23:00
    PM1051.7
    Date TimeFeb 23 22:00
    PM1049.8
    Date TimeFeb 23 21:00
    PM1065.4
    Date TimeFeb 23 20:00
    PM1072.1
    Date TimeFeb 23 19:00
    PM1072.1
    Date TimeFeb 23 18:00
    PM1060.9
    Date TimeFeb 23 17:00
    PM1049.8
    Date TimeFeb 23 16:00
    PM1041.6
    Date TimeFeb 23 15:00
    PM1041.9
    Date TimeFeb 23 14:00
    PM1039.3
    Date TimeFeb 23 13:00
    PM1039.3
    Date TimeFeb 23 12:00
    PM1036.9
    Date TimeFeb 23 11:00
    PM1038.4
    Date TimeFeb 23 10:00
    PM1042.3
    Date TimeFeb 23 09:00
    PM1038.9
    Date TimeFeb 23 08:00
    PM1037.6
    Date TimeFeb 23 07:00
    PM1037.7
    Date TimeFeb 23 06:00
    PM1042.5
    Date TimeFeb 23 05:00
    PM1040.6
    Date TimeFeb 23 04:00
    PM1027.1
    PM2.5
    PM2.5 concentration
    1-Hour
    PM2.5 1-Hour Average Concentration Summary
    Date TimeConcentration (µg/m3)
    Feb 24 03:0020.3
    Feb 24 02:0019.2
    Feb 24 01:0018.7
    Feb 24 00:0020.9
    Feb 23 23:0024.2
    Feb 23 22:0024
    Feb 23 21:0030
    Feb 23 20:0027.9
    Feb 23 19:0029
    Feb 23 18:0028.1
    Feb 23 17:0025
    Feb 23 16:0023.4
    Feb 23 15:0025.5
    Feb 23 14:0023.3
    Feb 23 13:0024.3
    Feb 23 12:0023.1
    Feb 23 11:0027
    Feb 23 10:0033.1
    Feb 23 09:0032.7
    Feb 23 08:0032.5
    Feb 23 07:0032.9
    Feb 23 06:0037.7
    Feb 23 05:0035.6
    Feb 23 04:0024
    Date TimeFeb 24 03:00
    PM2.520.3
    Date TimeFeb 24 02:00
    PM2.519.2
    Date TimeFeb 24 01:00
    PM2.518.7
    Date TimeFeb 24 00:00
    PM2.520.9
    Date TimeFeb 23 23:00
    PM2.524.2
    Date TimeFeb 23 22:00
    PM2.524
    Date TimeFeb 23 21:00
    PM2.530
    Date TimeFeb 23 20:00
    PM2.527.9
    Date TimeFeb 23 19:00
    PM2.529
    Date TimeFeb 23 18:00
    PM2.528.1
    Date TimeFeb 23 17:00
    PM2.525
    Date TimeFeb 23 16:00
    PM2.523.4
    Date TimeFeb 23 15:00
    PM2.525.5
    Date TimeFeb 23 14:00
    PM2.523.3
    Date TimeFeb 23 13:00
    PM2.524.3
    Date TimeFeb 23 12:00
    PM2.523.1
    Date TimeFeb 23 11:00
    PM2.527
    Date TimeFeb 23 10:00
    PM2.533.1
    Date TimeFeb 23 09:00
    PM2.532.7
    Date TimeFeb 23 08:00
    PM2.532.5
    Date TimeFeb 23 07:00
    PM2.532.9
    Date TimeFeb 23 06:00
    PM2.537.7
    Date TimeFeb 23 05:00
    PM2.535.6
    Date TimeFeb 23 04:00
    PM2.524
    Current Air Quality Summary by District
    Chart
    List
    AQHI
    Search
    4
    Central/Western
    4
    Southern
    5
    Eastern
    4
    Kwun Tong
    4
    Sham Shui Po
    4
    Kwai Chung
    3
    Tsuen Wan
    5
    Tseung Kwan O
    3
    Yuen Long
    4
    Tuen Mun
    2
    Tung Chung
    4
    Tai Po
    4
    Sha Tin
    4
    North
    5
    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 February 24, 2026 03:00)
    General Stations
    Station NamesNO2O3SO2COPM10PM2.5AQHI
    Central/Western9.993.11.6-57.720.34
    Southern8.890.73.3363.844.914.94
    Eastern15.498.70.6-8430.15
    Kwun Tong20.181.22.7-87.330.14
    Sham Shui Po14.877.43.6-61.827.44
    Kwai Chung14.188.31.1-38.516.94
    Tsuen Wan1176.50.6461.430.411.93
    Tseung Kwan O7.796.24.3415.210127.15
    Yuen Long7.878.51.4843.432.715.33
    Tuen Mun11.985.52.5558.944.119.14
    Tung Chung7.547.70.3848.629.816.42
    Tai Po5.595.84.9-8125.44
    Sha Tin4.599.42.5-42.612.34
    North7.893.82.9515.676.229.64
    Tap Mun6.399.31.9400.992.226.15
    Roadside Stations
    Station NamesNO2O3SO2COPM10PM2.5AQHI
    Causeway Bay16.980.72.4188.252.516.94
    Central1880.74.2237.462.724.84
    Mong Kok-77.1--59.521.14
    Station NamesCentral/Western(General Stations)
    NO29.9
    O393.1
    SO21.6
    CO-
    PM1057.7
    PM2.520.3
    AQHI4
    Station NamesSouthern(General Stations)
    NO28.8
    O390.7
    SO23.3
    CO363.8
    PM1044.9
    PM2.514.9
    AQHI4
    Station NamesEastern(General Stations)
    NO215.4
    O398.7
    SO20.6
    CO-
    PM1084
    PM2.530.1
    AQHI5
    Station NamesKwun Tong(General Stations)
    NO220.1
    O381.2
    SO22.7
    CO-
    PM1087.3
    PM2.530.1
    AQHI4
    Station NamesSham Shui Po(General Stations)
    NO214.8
    O377.4
    SO23.6
    CO-
    PM1061.8
    PM2.527.4
    AQHI4
    Station NamesKwai Chung(General Stations)
    NO214.1
    O388.3
    SO21.1
    CO-
    PM1038.5
    PM2.516.9
    AQHI4
    Station NamesTsuen Wan(General Stations)
    NO211
    O376.5
    SO20.6
    CO461.4
    PM1030.4
    PM2.511.9
    AQHI3
    Station NamesTseung Kwan O(General Stations)
    NO27.7
    O396.2
    SO24.3
    CO415.2
    PM10101
    PM2.527.1
    AQHI5
    Station NamesYuen Long(General Stations)
    NO27.8
    O378.5
    SO21.4
    CO843.4
    PM1032.7
    PM2.515.3
    AQHI3
    Station NamesTuen Mun(General Stations)
    NO211.9
    O385.5
    SO22.5
    CO558.9
    PM1044.1
    PM2.519.1
    AQHI4
    Station NamesTung Chung(General Stations)
    NO27.5
    O347.7
    SO20.3
    CO848.6
    PM1029.8
    PM2.516.4
    AQHI2
    Station NamesTai Po(General Stations)
    NO25.5
    O395.8
    SO24.9
    CO-
    PM1081
    PM2.525.4
    AQHI4
    Station NamesSha Tin(General Stations)
    NO24.5
    O399.4
    SO22.5
    CO-
    PM1042.6
    PM2.512.3
    AQHI4
    Station NamesNorth(General Stations)
    NO27.8
    O393.8
    SO22.9
    CO515.6
    PM1076.2
    PM2.529.6
    AQHI4
    Station NamesTap Mun(General Stations)
    NO26.3
    O399.3
    SO21.9
    CO400.9
    PM1092.2
    PM2.526.1
    AQHI5
    Station NamesCauseway Bay(Roadside Stations)
    NO216.9
    O380.7
    SO22.4
    CO188.2
    PM1052.5
    PM2.516.9
    AQHI4
    Station NamesCentral(Roadside Stations)
    NO218
    O380.7
    SO24.2
    CO237.4
    PM1062.7
    PM2.524.8
    AQHI4
    Station NamesMong Kok(Roadside Stations)
    NO2-
    O377.1
    SO2-
    CO-
    PM1059.5
    PM2.521.1
    AQHI4
    AQHI QR CodeEPD AQHI : Past 24-Hour Air Quality Summary