SmogRank / Countries / Thailand
Most polluted cities in Thailand
7 measured cities ranked by PM2.5, last 7 days. Worst: Chiang Mai at 9.4 µg/m³, #619 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Chiang Mai low-cost sensorsChiang Mai | 9.4 | |
| 2 | Bang Pakong low-cost sensorsChachoengsao | 8.8 | |
| 3 | Ban Khlong Prawet low-cost sensorsBangkok | 7.6 | |
| 4 | Khlong Luang low-cost sensorsPathum Thani | 7.5 | |
| 5 | Bangkok low-cost sensorsBangkok | 7.4 | |
| 6 | Sai Mai low-cost sensorsBangkok | 6.8 | |
| 7 | Uttaradit low-cost sensorsUttaradit | 6.6 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Estimated: cities without a monitor
Thailand 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 |
|---|---|
| Samut Prakan estimated | ≈ 9 µg/m³ |
| Mueang Nonthaburi estimated | ≈ 15 µg/m³ |
| Chon Buri estimated | ≈ 9 µg/m³ |
| Phra Pradaeng estimated | ≈ 9 µg/m³ |
| Bang Khae estimated | ≈ 9 µg/m³ |
| Hat Yai estimated | ≈ 9 µg/m³ |
| Pak Kret estimated | ≈ 15 µg/m³ |
| Si Racha estimated | ≈ 9 µg/m³ |
| Watthana estimated | ≈ 9 µg/m³ |
| Khlong Sam Wa estimated | ≈ 13 µg/m³ |
| Bang Khun Thian estimated | ≈ 9 µg/m³ |
| Lat Krabang estimated | ≈ 12 µg/m³ |
| Chatuchak estimated | ≈ 15 µg/m³ |
| Chom Thong estimated | ≈ 9 µg/m³ |
| Nong Chok estimated | ≈ 13 µg/m³ |
| Lampang estimated | ≈ 6 µg/m³ |
| Nong Khaem estimated | ≈ 9 µg/m³ |
| Bang Kapi estimated | ≈ 12 µg/m³ |
| Bueng Kum estimated | ≈ 12 µg/m³ |
| Kabin Buri estimated | ≈ 6 µg/m³ |
| Surat Thani estimated | ≈ 6 µg/m³ |
| Udon Thani estimated | ≈ 4 µg/m³ |
| Din Daeng estimated | ≈ 9 µg/m³ |
| Nakhon Ratchasima estimated | ≈ 4 µg/m³ |
| Hua Hin estimated | ≈ 3 µg/m³ |
| Bang Sue estimated | ≈ 15 µg/m³ |
| Ban Samae Dam estimated | ≈ 9 µg/m³ |
| Ubon Ratchathani estimated | ≈ 6 µg/m³ |
| Lat Phrao estimated | ≈ 13 µg/m³ |
| Phasi Charoen estimated | ≈ 9 µg/m³ |
| Ban I Chang estimated | ≈ 6 µg/m³ |
| Thon Buri estimated | ≈ 9 µg/m³ |
| Nakhon Pathom estimated | ≈ 6 µg/m³ |
| Bangkok Noi estimated | ≈ 9 µg/m³ |
| Thung Khru estimated | ≈ 9 µg/m³ |
| Pattaya estimated | ≈ 7 µg/m³ |
| Suan Luang estimated | ≈ 12 µg/m³ |
| Wang Thonglang estimated | ≈ 12 µg/m³ |
| Khon Kaen estimated | ≈ 6 µg/m³ |
| Lak Si estimated | ≈ 15 µg/m³ |
Regions
Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.