SmogRank / Countries / Thailand

Most polluted cities in Thailand

7 measured cities, last 24 hours; 7 above the WHO 24-hour guideline. Worst: Bang Pakong at 26.7 µg/m³, #38 in the world.

7 moderate

  1. 1Bang Pakonglow-cost sensorsChachoengsao 26.71.8×
  2. 2Bangkoklow-cost sensorsBangkok 25.21.7×
  3. 3Ban Khlong Prawetlow-cost sensorsBangkok 25.01.7×
  4. 4Chiang Mailow-cost sensorsChiang Mai 22.11.5×
  5. 5Khlong Luanglow-cost sensorsPathum Thani 21.61.4×
  6. 6Sai Mailow-cost sensorsBangkok 21.31.4×
  7. 7Uttaraditlow-cost sensorsUttaradit 17.51.2×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

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.

City7-day estimateBand
Samut Prakan≈ 9 µg/m³Good
Mueang Nonthaburi≈ 15 µg/m³Moderate
Chon Buri≈ 9 µg/m³Good
Phra Pradaeng≈ 9 µg/m³Good
Bang Khae≈ 9 µg/m³Good
Hat Yai≈ 9 µg/m³Moderate
Pak Kret≈ 15 µg/m³Moderate
Si Racha≈ 9 µg/m³Good
Watthana≈ 9 µg/m³Good
Khlong Sam Wa≈ 13 µg/m³Moderate
Bang Khun Thian≈ 9 µg/m³Good
Lat Krabang≈ 12 µg/m³Moderate
Chatuchak≈ 15 µg/m³Moderate
Chom Thong≈ 9 µg/m³Good
Nong Chok≈ 13 µg/m³Moderate
Lampang≈ 6 µg/m³Good
Nong Khaem≈ 9 µg/m³Good
Bang Kapi≈ 12 µg/m³Moderate
Bueng Kum≈ 12 µg/m³Moderate
Kabin Buri≈ 6 µg/m³Good
Surat Thani≈ 6 µg/m³Good
Udon Thani≈ 4 µg/m³Good
Din Daeng≈ 9 µg/m³Good
Nakhon Ratchasima≈ 4 µg/m³Good
Hua Hin≈ 3 µg/m³Good
Bang Sue≈ 15 µg/m³Moderate
Ban Samae Dam≈ 9 µg/m³Good
Ubon Ratchathani≈ 6 µg/m³Good
Lat Phrao≈ 13 µg/m³Moderate
Phasi Charoen≈ 9 µg/m³Good
Ban I Chang≈ 6 µg/m³Good
Thon Buri≈ 9 µg/m³Good
Nakhon Pathom≈ 6 µg/m³Good
Bangkok Noi≈ 9 µg/m³Good
Thung Khru≈ 9 µg/m³Good
Pattaya≈ 7 µg/m³Good
Suan Luang≈ 12 µg/m³Moderate
Wang Thonglang≈ 12 µg/m³Moderate
Khon Kaen≈ 6 µg/m³Good
Lak Si≈ 15 µg/m³Moderate

Regions

Bangkok 3Chachoengsao 1Chiang Mai 1Pathum Thani 1Uttaradit 1

Measured cities in each region (30 days).

Updated 2026-10-01 22:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.