SmogRank / World / Asia / Thailand / Bangkok
Most polluted cities in Bangkok, Thailand
14 measured cities, this year; 14 above the WHO annual guideline. Worst: Bang Na at 25.5 µg/m³, #252 in the world.
About 447K people in these 5 cities breathed unhealthy air on an average day so far this year.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Bangkok 386K
- 2Nong Khaem 20.3K
- 3Sai Mai 18.7K
- 4Lak Si 11.4K
- 5Ban Khlong Prawet 10.2K
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 |
|---|---|
| Bang Khae | ≈ 19 µg/m³ |
| Watthana | ≈ 16 µg/m³ |
| Chatuchak | ≈ 24 µg/m³ |
| Chom Thong | ≈ 19 µg/m³ |
| Din Daeng | ≈ 16 µg/m³ |
| Bang Sue | ≈ 24 µg/m³ |
| Lat Phrao | ≈ 22 µg/m³ |
| Phasi Charoen | ≈ 19 µg/m³ |
| Thon Buri | ≈ 19 µg/m³ |
| Bangkok Noi | ≈ 19 µg/m³ |
| Thung Khru | ≈ 19 µg/m³ |
| Suan Luang | ≈ 19 µg/m³ |
| Wang Thonglang | ≈ 18 µg/m³ |
| Khlong Toei | ≈ 16 µg/m³ |
| Dusit | ≈ 17 µg/m³ |
| Taling Chan | ≈ 19 µg/m³ |
| Bang Bon | ≈ 19 µg/m³ |
| Bang Rak | ≈ 17 µg/m³ |
| Bang Phlat | ≈ 17 µg/m³ |
| Phra Khanong | ≈ 19 µg/m³ |
| Rat Burana | ≈ 19 µg/m³ |
| Sathon | ≈ 19 µg/m³ |
| Yan Nawa | ≈ 17 µg/m³ |
| Huai Khwang | ≈ 16 µg/m³ |
| Thawi Watthana | ≈ 19 µg/m³ |
| Khlong San | ≈ 17 µg/m³ |
| Ratchathewi | ≈ 16 µg/m³ |
| Bangkok Yai | ≈ 19 µg/m³ |
| Phaya Thai | ≈ 16 µg/m³ |
| Ban Tha Kham | ≈ 19 µg/m³ |
| Pathum Wan | ≈ 17 µg/m³ |
| Ban Lak Song | ≈ 19 µg/m³ |
| Phra Nakhon | ≈ 17 µg/m³ |
| Pom Prap Sattru Phai | ≈ 17 µg/m³ |
| Khwaeng Bang Khae | ≈ 19 µg/m³ |
| Bang Khlo | ≈ 19 µg/m³ |
| Sam Sen Nai | ≈ 16 µg/m³ |
| Samphanthawong | ≈ 17 µg/m³ |
| Ban Khlong Bang Bon | ≈ 19 µg/m³ |
| Bang Kho Laem | ≈ 19 µg/m³ |
Bad-air episodes in Bangkok
- Thailand and Laos, November and December 202530 November to 3 December 2025, 4 days23 cities64 µg/m³peak, Mueang Nonthaburi
- Thailand and Laos, March 202520 to 29 March 2025, 10 days56 cities154 µg/m³peak, Vientiane
- Thailand, 12 to 13 February 20252 days18 cities88 µg/m³peak, Samut Sakhon
- Northern Thailand, January 202523 to 26 January 2025, 4 days51 cities117 µg/m³peak, Khlong Luang
- Thailand and Laos, October 20246 October 2024, 1 day24 cities45 µg/m³peak, Kanchanaburi
- Thailand and Laos, April and May 202428 April to 7 May 2024, 10 days47 cities237 µg/m³peak, Chiang Khong
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in Bangkok, Thailand, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/th/region/bangkok?w=year.
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.