SmogRank / World / Asia / Thailand / Bangkok

Most polluted cities in Bangkok, Thailand

13 measured cities, last 30 days; 6 above the WHO 24-hour guideline. Worst: Bang Na at 18.2 µg/m³, #276 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.

← Bang Na 0% 0.75%0

Every measured city in Bangkok, Thailand, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Bangkok cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City	7-day estimate	Band
Bang Khae	≈ 19 µg/m³	Moderate
Watthana	≈ 16 µg/m³	Moderate
Chatuchak	≈ 24 µg/m³	Moderate
Chom Thong	≈ 19 µg/m³	Moderate
Din Daeng	≈ 16 µg/m³	Moderate
Bang Sue	≈ 24 µg/m³	Moderate
Lat Phrao	≈ 22 µg/m³	Moderate
Phasi Charoen	≈ 19 µg/m³	Moderate
Thon Buri	≈ 19 µg/m³	Moderate
Bangkok Noi	≈ 19 µg/m³	Moderate
Thung Khru	≈ 19 µg/m³	Moderate
Suan Luang	≈ 19 µg/m³	Moderate
Wang Thonglang	≈ 18 µg/m³	Moderate
Khlong Toei	≈ 16 µg/m³	Moderate
Dusit	≈ 17 µg/m³	Moderate
Taling Chan	≈ 19 µg/m³	Moderate
Bang Bon	≈ 19 µg/m³	Moderate
Bang Rak	≈ 17 µg/m³	Moderate
Bang Phlat	≈ 17 µg/m³	Moderate
Phra Khanong	≈ 19 µg/m³	Moderate
Rat Burana	≈ 19 µg/m³	Moderate
Sathon	≈ 19 µg/m³	Moderate
Yan Nawa	≈ 17 µg/m³	Moderate
Huai Khwang	≈ 16 µg/m³	Moderate
Thawi Watthana	≈ 19 µg/m³	Moderate
Khlong San	≈ 17 µg/m³	Moderate
Ratchathewi	≈ 16 µg/m³	Moderate
Bangkok Yai	≈ 19 µg/m³	Moderate
Phaya Thai	≈ 16 µg/m³	Moderate
Ban Tha Kham	≈ 19 µg/m³	Moderate
Pathum Wan	≈ 17 µg/m³	Moderate
Ban Lak Song	≈ 19 µg/m³	Moderate
Phra Nakhon	≈ 17 µg/m³	Moderate
Pom Prap Sattru Phai	≈ 17 µg/m³	Moderate
Khwaeng Bang Khae	≈ 19 µg/m³	Moderate
Bang Khlo	≈ 19 µg/m³	Moderate
Sam Sen Nai	≈ 16 µg/m³	Moderate
Samphanthawong	≈ 17 µg/m³	Moderate
Ban Khlong Bang Bon	≈ 19 µg/m³	Moderate
Bang Kho Laem	≈ 19 µg/m³	Moderate

Bad-air episodes in Bangkok

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/th/region/bangkok?w=30d.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.