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Past Air Quality

Tai Po
AQHI
Tai Po
AQHI
Tai Po (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)
Graph
Table
Date TimeAQHI
Feb 24 04:004
Feb 24 03:004
Feb 24 02:004
Feb 24 01:004
Feb 24 00:004
Feb 23 23:005
Feb 23 22:005
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 12:005
Feb 23 11:004
Feb 23 10:004
Feb 23 09:004
Feb 23 08:003
Feb 23 07:002
Feb 23 06:002
Feb 23 05:002
Date TimeFeb 24 04:00
AQHI4
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
AQHI5
Date TimeFeb 23 22:00
AQHI5
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
AQHI5
Date TimeFeb 23 11:00
AQHI4
Date TimeFeb 23 10:00
AQHI4
Date TimeFeb 23 09:00
AQHI4
Date TimeFeb 23 08:00
AQHI3
Date TimeFeb 23 07:00
AQHI2
Date TimeFeb 23 06:00
AQHI2
Date TimeFeb 23 05:00
AQHI2
  1. Time shown is in Hong Kong time.
  2. The AQHI information is based on real time data taken directly from EPD's Air Quality Monitoring Network.
Tai Po
Pollutant Concentration(µg/m3)
Graph
Table
NO2 (1-hour average)
NO2 (1-hour average)
O3 (1-hour average)
O3 (1-hour average)
O3 (8-hour average)
O3 (8-hour average)
SO2 (1-hour average)
SO2 (1-hour average)
PM10 (1-hour average)
PM10 (1-hour average)
PM10 (24-hour average)
PM10 (24-hour average)
PM2.5 (1-hour average)
PM2.5 (1-hour average)
PM2.5 (24-hour average)
PM2.5 (24-hour average)
Date TimeNO2O3SO2COPM10PM2.5
1-Hour1-Hour8-Hour1-Hour1-Hour1-Hour24-Hour1-Hour24-Hour
Feb 24 04:00790.5994.7-83.45025.425
Feb 24 03:005.595.81024.9-814725.425
Feb 24 02:006.298.91034.8-71.94526.225
Feb 24 01:009.792.81044.8-62.9432425
Feb 24 00:0012.296.41085-64.24224.925
Feb 23 23:0012.4101.51125.1-58.14122.725
Feb 23 22:0011.3106.31154.9-62.74024.225
Feb 23 21:0012.1110.21174.8-63.73824.325
Feb 23 20:0013.2113.21184.8-62.4372625
Feb 23 19:0018.5104.41184.8-583528.125
Feb 23 18:0021.7108.11195.3-51.53425.725
Feb 23 17:0012.6125.81195.5-453321.225
Feb 23 16:0014.1127.91155.4-32.23217.525
Feb 23 15:00131241045.6-31.93218.825
Feb 23 14:0010.7118.61025.4-34.5322125
Feb 23 13:0011.8119865.6-42.33124.125
Feb 23 12:0014.9117.8716-44.83025.324
Feb 23 11:0016112.8577.2-35.82925.324
Feb 23 10:0018.1105.3436.8-39.12930.824
Feb 23 09:0022.493296.7-39.92933.924
Feb 23 08:0036.644.5175.9-43.62938.124
Feb 23 07:0038.5-125.7-32.12828.123
Feb 23 06:0035.611.513--27.22823.523
Feb 23 05:0035.513.3145.3-262922.224
Date Time2026-02-24 04:00
NO27
O390.5
SO24.7
CO-
PM1083.4
PM2.525.4
Date Time2026-02-24 03:00
NO25.5
O395.8
SO24.9
CO-
PM1081
PM2.525.4
Date Time2026-02-24 02:00
NO26.2
O398.9
SO24.8
CO-
PM1071.9
PM2.526.2
Date Time2026-02-24 01:00
NO29.7
O392.8
SO24.8
CO-
PM1062.9
PM2.524
Date Time2026-02-24 00:00
NO212.2
O396.4
SO25
CO-
PM1064.2
PM2.524.9
Date Time2026-02-23 23:00
NO212.4
O3101.5
SO25.1
CO-
PM1058.1
PM2.522.7
Date Time2026-02-23 22:00
NO211.3
O3106.3
SO24.9
CO-
PM1062.7
PM2.524.2
Date Time2026-02-23 21:00
NO212.1
O3110.2
SO24.8
CO-
PM1063.7
PM2.524.3
Date Time2026-02-23 20:00
NO213.2
O3113.2
SO24.8
CO-
PM1062.4
PM2.526
Date Time2026-02-23 19:00
NO218.5
O3104.4
SO24.8
CO-
PM1058
PM2.528.1
Date Time2026-02-23 18:00
NO221.7
O3108.1
SO25.3
CO-
PM1051.5
PM2.525.7
Date Time2026-02-23 17:00
NO212.6
O3125.8
SO25.5
CO-
PM1045
PM2.521.2
Date Time2026-02-23 16:00
NO214.1
O3127.9
SO25.4
CO-
PM1032.2
PM2.517.5
Date Time2026-02-23 15:00
NO213
O3124
SO25.6
CO-
PM1031.9
PM2.518.8
Date Time2026-02-23 14:00
NO210.7
O3118.6
SO25.4
CO-
PM1034.5
PM2.521
Date Time2026-02-23 13:00
NO211.8
O3119
SO25.6
CO-
PM1042.3
PM2.524.1
Date Time2026-02-23 12:00
NO214.9
O3117.8
SO26
CO-
PM1044.8
PM2.525.3
Date Time2026-02-23 11:00
NO216
O3112.8
SO27.2
CO-
PM1035.8
PM2.525.3
Date Time2026-02-23 10:00
NO218.1
O3105.3
SO26.8
CO-
PM1039.1
PM2.530.8
Date Time2026-02-23 09:00
NO222.4
O393
SO26.7
CO-
PM1039.9
PM2.533.9
Date Time2026-02-23 08:00
NO236.6
O344.5
SO25.9
CO-
PM1043.6
PM2.538.1
Date Time2026-02-23 07:00
NO238.5
O3-
SO25.7
CO-
PM1032.1
PM2.528.1
Date Time2026-02-23 06:00
NO235.6
O311.5
SO2-
CO-
PM1027.2
PM2.523.5
Date Time2026-02-23 05:00
NO235.5
O313.3
SO25.3
CO-
PM1026
PM2.522.2
  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 is based on real time data taken directly from EPD's Air Quality Monitoring Network.
Tai Po
Added Health Risk Summary
Graph
Table
Added Health Risk Summary
7.35
SO2
0.067 (1%)
NO2
0.278 (4%)
O3
4.756 (65%)
PM
2.247 (31%)
Added Health RiskIncrease in health risk by air pollutant (percentage)
SO2NO2O3PM
7.350.067 (1%)0.278 (4%)4.756 (65%)2.247 (31%)
Added Health Risk7.35
Increase in health risk by air pollutant (percentage)
SO20.067 (1%)
NO20.278 (4%)
O34.756 (65%)
PM2.247 (31%)
  1. Time shown is in Hong Kong time.
  2. The total percentage may not be equal to 100% due to rounding.
  3. Abbreviation:
    SO2 - sulphur dioxide, NO2 - nitrogen dioxide, O3 - ozone,
    PM – respirable suspended particulates (PM10) or fine suspended particulates (PM2.5), whichever poses a higher health risk.
  4. The AQHI information is based on real time data taken directly from EPD's Air Quality Monitoring Network.
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