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Air quality · Thailand

Bangkok Air Quality Index (AQI) today

Modelled estimate for 20:00 local time (UTC+7), refreshed 3 Nov, 07:52 UTC+0.

201 Very unhealthy

Live estimate · modelled

US EPA AQI20:00 UTC+7, 3 Nov Main pollutant: O₃

Health alert: the risk of health effects is increased for everyone.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 94.

Over the next 24 hours the model expects the AQI to range from 75 around 07:00 to 190 around 19:00 (4 Nov).

7th most polluted of 849 cities worldwide right now.

What to do today

  • Long walk or run outside Avoid
  • Kids playing outside Keep indoors
  • Airing the house Keep closed
  • Mask outdoors N95 outdoors

Based on the US EPA’s health statement: “Health alert: the risk of health effects is increased for everyone.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

21:00 · 203 22:00 · 177 23:00 · 143 00:00 · 101 01:00 · 88 02:00 · 88 03:00 · 88 04:00 · 88 05:00 · 90 06:00 · 92 07:00 · 94 08:00 · 96 09:00 · 97 10:00 · 98 11:00 · 99 12:00 · 98 13:00 · 95 14:00 · 115 15:00 · 156 16:00 · 182 17:00 · 200 18:00 · 204 19:00 · 204 20:00 · 201 21:00 · 187 22:00 · 166 23:00 · 147 00:00 · 119 01:00 · 104 02:00 · 97 03:00 · 92 04:00 · 83 05:00 · 81 06:00 · 76 07:00 · 75 08:00 · 75 09:00 · 75 10:00 · 77 11:00 · 79 12:00 · 80 13:00 · 80 14:00 · 87 15:00 · 119 16:00 · 151 17:00 · 172 18:00 · 187 19:00 · 190 20:00 · 185 21:00 · 172 22:00 · 151 23:00 · 122 00:00 · 111 01:00 · 106 02:00 · 104 03:00 · 104 04:00 · 104 05:00 · 104 06:00 · 102 07:00 · 87 08:00 · 86 09:00 · 88 10:00 · 89 11:00 · 90 12:00 · 92 13:00 · 93 14:00 · 92 Now

US EPA AQI per hour, UTC+7. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 21:00203
Mon 22:00177
Mon 23:00143
Tue 00:00101
Tue 01:0088
Tue 02:0088
Tue 03:0088
Tue 04:0088
Tue 05:0090
Tue 06:0092
Tue 07:0094
Tue 08:0096
Tue 09:0097
Tue 10:0098
Tue 11:0099
Tue 12:0098
Tue 13:0095
Tue 14:00115
Tue 15:00156
Tue 16:00182
Tue 17:00200
Tue 18:00204
Tue 19:00204
Tue 20:00 · Now201
Tue 21:00 · Forecast187
Tue 22:00 · Forecast166
Tue 23:00 · Forecast147
Wed 00:00 · Forecast119
Wed 01:00 · Forecast104
Wed 02:00 · Forecast97
Wed 03:00 · Forecast92
Wed 04:00 · Forecast83
Wed 05:00 · Forecast81
Wed 06:00 · Forecast76
Wed 07:00 · Forecast75
Wed 08:00 · Forecast75
Wed 09:00 · Forecast75
Wed 10:00 · Forecast77
Wed 11:00 · Forecast79
Wed 12:00 · Forecast80
Wed 13:00 · Forecast80
Wed 14:00 · Forecast87
Wed 15:00 · Forecast119
Wed 16:00 · Forecast151
Wed 17:00 · Forecast172
Wed 18:00 · Forecast187
Wed 19:00 · Forecast190
Wed 20:00 · Forecast185
Wed 21:00 · Forecast172
Wed 22:00 · Forecast151
Wed 23:00 · Forecast122
Thu 00:00 · Forecast111
Thu 01:00 · Forecast106
Thu 02:00 · Forecast104
Thu 03:00 · Forecast104
Thu 04:00 · Forecast104
Thu 05:00 · Forecast104
Thu 06:00 · Forecast102
Thu 07:00 · Forecast87
Thu 08:00 · Forecast86
Thu 09:00 · Forecast88
Thu 10:00 · Forecast89
Thu 11:00 · Forecast90
Thu 12:00 · Forecast92
Thu 13:00 · Forecast93
Thu 14:00 · Forecast92

Pollutants this hour

  • PM2.5 38.6 µg/m³ 24-hour mean 32.2 µg/m³ · 2.1× WHO’s 24-hour guideline (15) 100
  • PM10 39 µg/m³ 32
  • O₃ 158 µg/m³ 201
  • NO₂ 36 µg/m³ 18
  • SO₂ 22 µg/m³ 11
  • CO 2.86 mg/m³ 15

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Vientiane Laos 65
Phnom Penh Cambodia 62
Takeo Cambodia 62
Yangon Myanmar 87
Cần Thơ Vietnam 59
Ho Chi Minh City Vietnam 74
Biên Hòa Vietnam 74

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Bangkok’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Bangkok right now?
201 on the US EPA scale (Very unhealthy) at 20:00 UTC+7, 3 Nov. O₃ is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Bangkok today?
Consider shortening outdoor exercise; sensitive groups should move it indoors. The EPA’s statement for “Very unhealthy”: Health alert: the risk of health effects is increased for everyone. General guidance, not medical advice.

Will the air in Bangkok get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 75 around 07:00 to 190 around 19:00 (4 Nov). Forecasts beyond a day are less certain.

How does Bangkok compare with other cities?
Right now it is the 7th most polluted of 849 cities we track worldwide, all on the same US EPA scale.

Why does another app show a different AQI for Bangkok?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.