Thailand Clean-Air Board — live PM2.5 for all 35 cities
All 35 cities ranked cleanest to dustiest on live PM2.5, with a five-day dust outlook for each. It answers one question: where in Thailand can I go right now to escape burning-season smoke?
Where does the air-quality data come from?
PM2.5 and US AQI come from the free Open-Meteo air-quality API, fetched in the reader's browser for all 35 city coordinates in a single batched request and cached for about an hour. Because the numbers are live, they are not baked into this page — open the board to see current values.
What counts as unhealthy PM2.5?
The board flags a day when the daily mean exceeds 35 µg/m³, the US EPA "unhealthy for sensitive groups" line. A burning-season banner appears only when at least five cities are over that threshold at once — it is driven by live readings, never by the calendar, so it correctly stays hidden in the wet season.
When is Thailand's burning season?
Northern Thailand (Chiang Mai, Chiang Rai, Pai, Nan) typically suffers the worst agricultural-burning haze between roughly February and April, while the southern islands and the Gulf coast stay comparatively clear. The board is the live check on that general pattern.
Cities covered
Chiang Mai · Bangkok · Phuket · Koh Samui · Koh Phangan · Hua Hin · Pattaya · Koh Lanta · Hat Yai · Chonburi · Nakhon Ratchasima · Krabi · Khon Kaen · Udon Thani · Chiang Rai · Koh Tao · Ubon Ratchathani · Khao Lak · Trang · Nong Khai · Phetchaburi · Ko Chang · Nan · Chanthaburi · Buriram · Kanchanaburi · Ayutthaya · Nakhon Phanom · Chiang Khan · Sukhothai · Ko Samet · Pai · Ko Lipe · Ko Phi Phi · Ko Phayam