SmogRank / World / Thailand / Chiang Rai / September 2025
Most polluted cities in Chiang Rai, Thailand, September 2025
1 city in Chiang Rai, Thailand ranked by their average PM2.5 over the 30 days. The only one: Chiang Rai at 8.7 µg/m³, #948 of 3,052 cities in the world. A city needs measurements on 70% of the days to be ranked.
- 1Chiang Rai 48
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
All cities in the world, September 2025 · All cities in Thailand, September 2025 · Chiang Rai now
Use this board
SmogRank, most polluted cities in Chiang Rai, Thailand, PM2.5, September 2025, smogrank.com/th/region/chiang-rai/history/2025-09 (accessed 7 Oct 2026).
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.