SmogRank / World / Thailand / Chiang Rai / June 2026
Most polluted cities in Chiang Rai, Thailand, June 2026
2 cities in Chiang Rai, Thailand ranked by their average PM2.5 over the 30 days. Worst: Mae Sai at 15.4 µg/m³, #334 of 2,466 cities in the world. Cleanest: Chiang Rai at 9.1. A city needs measurements on 70% of the days to be ranked.
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.
- 1Mae Sai 0%
- 2Chiang Rai 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
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SmogRank, most polluted cities in Chiang Rai, Thailand, PM2.5, June 2026, smogrank.com/th/region/chiang-rai/history/2026-06 (accessed 6 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.