SmogRank / World / Asia / Thailand / Samut Prakan
Most polluted cities in Samut Prakan, Thailand
2 measured cities, last 30 days; 1 above the WHO 24-hour guideline. Worst: Phra Pradaeng at 16.0 µg/m³, #328 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.
- 1Phra Pradaeng 0%
- 2Samut Prakan 0%
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
Samut Prakan 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 |
|---|---|
| Ban Khlong Bang Sao Thong | ≈ 18 µg/m³ |
Bad-air episodes in Samut Prakan
- 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, April and May 202428 April to 7 May 2024, 10 days47 cities237 µg/m³peak, Chiang Khong
- Thailand, February 202413 to 20 February 2024, 8 days52 cities109 µg/m³peak, Kanchanaburi
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 Samut Prakan, Thailand, PM2.5, last 30 days to 6 Oct 2026, 22:00 UTC, smogrank.com/th/region/samut-prakan?w=30d.
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.