When is the best time to be outside in Bangkok?

Sat 21:00–0:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 58. The worst hour is around Sat 15:00, at 174.

What is the main pollutant in Bangkok?

Fine particles (PM2.5). It drives the index right now, at 22 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

How does Bangkok's air compare with the WHO guideline?

1.1 times the guideline. Over the next 24 hours PM2.5 averages about 17 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. O3 is also forecast above its guideline level.

How many cigarettes is a day of Bangkok's air?

About 0.8 cigarettes. Over the next 24 hours PM2.5 averages about 17 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

Will air quality in Bangkok improve this week?

Sunday looks cleanest. Its AQI peaks at 84, against 174 on Saturday, the worst day in the forecast.

Bangkok air quality

Q: Is the air in Bangkok safe today?

For most people, yes. Right now the US AQI in Bangkok is 76, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort. It is expected to reach 174 (unhealthy) around Sat 15:00.

Thailand · Live AQI and hourly forecast for the next 5 days · valid Sat 00:00 local time

Moderate

US AQI, mostly PM_2.5

Model estimate. Nearby measurements are shown separately.

Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.

Next 24 hours: 55–174US AQI, highest around Sat 15:00
Best time outside: Sat 21:00–0:00US AQI about 58
PM_2.5 vs WHO guideline: 1.1×17 µg/m³ over 24 h, guideline 15
Cigarette equivalent: ≈ 0.8 a dayBerkeley Earth rule of thumb

Loading the live globe…

The live globe, centred on Bangkok. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Bangkok right now

Pollutant	Now	Level	Next 24 h vs WHO
Fine particles PM_2.5	22 µg/m³	Moderate	1.1×
Coarse particles PM₁₀	23 µg/m³	Good	0.4×
Nitrogen dioxide NO₂	37 µg/m³	Good	1.0×
Ozone O₃	39 µg/m³	Good	1.6×
Sulphur dioxide SO₂	13 µg/m³	Good	0.3×
Carbon monoxide CO	2,592 µg/m³	Good	0.5×
Aerosol optical depth	0.30	Whole atmosphere · dimensionless
Desert dust	0 µg/m³	Modelled surface dust
UV index	0	Low

“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM_2.5, 45 for PM₁₀, 25 for NO₂, 40 for SO₂ and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline. Levels follow the US AQI, which is far less strict than the WHO, so air rated Good can still be above a guideline.

Next 48 hours

Hourly US AQI. Highest 174 around Sat 15:00, lowest 23 around Sun 21:00.

50100150

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Bangkok

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 200.

Day	US AQI	At worst	Worst hour	PM_2.5 avg	UV max
Sat 14 Nov	55–174	Unhealthy	15:00	17	7 High
Sun 15 Nov	23–84	Moderate	13:00	8.5	8 Very high
Mon 16 Nov	22–154	Unhealthy	13:00	9.1	9 Very high
Tue 17 Nov	27–105	Sensitive	14:00	12	8 Very high

Common questions about the air in Bangkok

Is the air in Bangkok safe today?
For most people, yes. Right now the US AQI in Bangkok is 76, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort. It is expected to reach 174 (unhealthy) around Sat 15:00.
When is the best time to be outside in Bangkok?
Sat 21:00–0:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 58. The worst hour is around Sat 15:00, at 174.
What is the main pollutant in Bangkok?
Fine particles (PM_2.5). It drives the index right now, at 22 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.
How does Bangkok's air compare with the WHO guideline?
1.1 times the guideline. Over the next 24 hours PM_2.5 averages about 17 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. O₃ is also forecast above its guideline level.
How many cigarettes is a day of Bangkok's air?
About 0.8 cigarettes. Over the next 24 hours PM_2.5 averages about 17 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Bangkok improve this week?
Sunday looks cleanest. Its AQI peaks at 84, against 174 on Saturday, the worst day in the forecast.

Measured near Bangkok

Station and measurements	Distance	US AQI	Level
National Economic and Social Development Council Office OpenAQ, reference monitor PM_2.5: 32 µg/m³ · Sat 00:00 PM₁₀: 74 µg/m³ · Sat 00:00	1.4 km	94	Moderate
Rama VIII Park OpenAQ, reference monitor PM_2.5: 21 µg/m³ · Sat 00:00	1.6 km	74	Moderate
Bangkok Noi Train Police Station OpenAQ, reference monitor PM_2.5: 21 µg/m³ · Sat 00:00	2.3 km	72	Moderate

Air quality near Bangkok

US AQI right now. Cleanest nearby: Phnom Penh (53); worst: Hanoi (207). The tick on each bar is Bangkok, at 76.

Phnom Penh 539 km SE 53 Moderate
Yangon 577 km NW 91 Moderate
Chiang Mai 582 km N 90 Moderate
Ho Chi Minh City 741 km SE 86 Moderate
Hanoi 987 km NE 207 Very unhealthy
Kuala Lumpur 1,188 km S 88 Moderate

All 162 cities →

About this forecast

Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (about 10 km inside Europe). Global runs update every 12 hours and European runs every 24 hours. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown. Nearby station measurements are independent observations, not adjustments to the forecast. The point forecast uses Open-Meteo’s CAMS products, including a separate carbon monoxide product; it can differ from the globe’s global grid. The AQI rates each hour on the US EPA scale, the same way the map colors it; official daily figures average over 24 hours (8 for ozone), so they can read lower after a short peak. Readings for 13.76°N, 100.50°E, valid 2026-11-13 17:00 UTC.