On 19 Jan 2026, PM2.5 levels in Bangkok surged above the standard into the orange zone, starting to affect health in 14 areas.
On 19 Jan 2026 at 07:00, the Bangkok Air Quality Information Center reported PM2.5 measurements ranging from 22.2 to 48.9 micrograms per cubic meter (µg/m³), showing an increasing trend compared to the same time yesterday. The levels exceeded the standard, reaching the orange zone indicating health effects, across 14 districts (standard limit is 37.5 µg/m³). These are:
1. Chatuchak district, in front of Kasetsart University: measured at 48.9 µg/m³.
2. Pathum Wan district, in front of Samyan Mitrtown shopping mall: measured at 45.2 µg/m³.
3. Lat Krabang district, in front of Nakharin Hospital: measured at 44.5 µg/m³.
4. Bang Rak district, beside the police booth in front of Bang Rak Lovely Plaza: measured at 41.6 µg/m³.
5. Lak Si district, inside the Lak Si district office: measured at 40.5 µg/m³.
6. Ratchathewi district, inside the Ratchathewi district office: measured at 39.7 µg/m³.
7. Khlong Sam Wa district, inside the Khlong Sam Wa district office: measured at 39.6 µg/m³.
8. Sathorn district, at the intersection in front of Sathorn district office on Saint Louis Soi: measured at 38.9 µg/m³.
9. Phra Nakhon district, inside the Phra Nakhon district office: measured at 38.5 µg/m³.
10. Bang Sue district, inside the Bang Sue district office: measured at 38.4 µg/m³.
11. Prawet district, in front of Seacon Square shopping mall: measured at 38.2 µg/m³.
12. Sai Mai district, bus stop in front of Sai Mai district office: measured at 37.9 µg/m³.
13. Wang Thonglang district, in front of Bangchak gas station on Lat Phrao 95 Soi: measured at 37.7 µg/m³.
14. Nong Chok district, in front of Nong Chok district office: measured at 37.6 µg/m³.
Health advice: The air quality in the orange zone means health effects are beginning.
General public: Use protective equipment such as PM2.5 masks whenever going outdoors. Limit the duration of strenuous outdoor activities or exercise. Watch for symptoms such as coughing, difficulty breathing, or eye irritation.
At-risk groups: Use protective equipment such as PM2.5 masks every time you go outside.
Avoid strenuous outdoor activities or exercise. Follow medical advice and seek medical attention immediately if symptoms appear.
1. Related factors (weather forecast affecting PM2.5 levels): From 19-21 Jan 2026, ventilation is weak, with a fairly closed atmospheric layer near the ground. Southern Bangkok will experience stronger southerly winds from the Gulf of Thailand, which is expected to reduce dust concentrations in that area.
From 22-24 Jan 2026, ventilation remains weak but with a chance of rain, which is expected to lower dust concentration. For today, morning fog and some areas with dense fog are forecast, with a 10% chance of rain.
2. Satellite hotspot data from NASA shows no abnormal heat spots indicating fires detected over Bangkok.
3. Authorities remind and inform the public to check air quality information before leaving home via:
In case the public spots pollution sources, they can report tips via Traffy Fondue.