PM2.5 & Air Quality Today
Live dust and air-quality readings from the Pollution Control Department's monitoring stations nationwide — see which provinces are worst right now, with clear health advice.
- Monitoring stations
- 173
- Provinces
- 74
- Data source
- Pollution Control Dept.
Station list updated 2026-09-12
Worst provinces right now
Ranked by each province's highest current PM2.5 reading. Tap a province for station-by-station detail.
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Check PM2.5 by province
Bangkok79Rayong6Samut Prakan6Lampang4Chon Buri3Chiang Mai2Chiang Rai2Nan2Samut Sakhon2Saraburi2Yala2Amnat Charoen1Ang Thong1Ayutthaya1Bueng Kan1Buri Ram1Chachoengsao1Chai Nat1Chaiyaphum1Chanthaburi1Chumphon1Kalasin1Kamphaeng Phet1Kanchanaburi1Khon Kaen1Krabi1Lamphun1Loei1Lop Buri1Mae Hong Son1Maha Sarakham1Mukdahan1Nakhon Nayok1Nakhon Pathom1Nakhon Phanom1Nakhon Ratchasima1Nakhon Sawan1Nakhon Si Thammarat1Narathiwat1Nong Bua Lam Phu1Nong Khai1Nonthaburi1Pathum Thani1Pattani1Phatthalung1Phayao1Phetchabun1Phichit1Phitsanulok1Phrae1Phuket1Prachin Buri1Prachuap Khiri Khan1Ratchaburi1Roi Et1Sa Kaeo1Sakon Nakhon1Samut Songkhram1Satun1Sing Buri1Si Sa Ket1Songkhla1Sukhothai1Suphan Buri1Surat Thani1Surin1Tak1Trang1Trat1Ubon Ratchathani1Udon Thani1Uthai Thani1Uttaradit1Yasothon1
How much PM2.5 is dangerous?
Thailand's air-quality bands (the new standard in force since 2023), based on 24-hour average PM2.5.
| Level | PM2.5 (µg/m³) | Advice |
|---|---|---|
| Excellent | 0 – 15.0 | Excellent air — outdoor activities as normal. |
| Good | 15.1 – 25.0 | Good air — outdoor activities as normal. |
| Moderate | 25.1 – 37.5 | Sensitive groups (children, the elderly, people with health conditions) should cut back on heavy outdoor activity. |
| Unhealthy (starting) | 37.6 – 75.0 | Reduce time outdoors and wear a dust-protection mask outside. |
| Unhealthy | over 75.0 | Avoid outdoor activities; wear an N95 mask if you must go out. |
PM2.5 frequently asked questions
- What is PM2.5?
- PM2.5 is particulate matter up to 2.5 microns across — small enough to pass into the lungs and bloodstream, which makes it far more harmful than ordinary dust, especially for the respiratory system, heart and blood vessels.
- At what level does PM2.5 become dangerous?
- Under the Thai standard, 24-hour average PM2.5 should not exceed 37.5 µg/m³. Above 37.5 it starts to affect health and outdoor activity should be reduced; above 75 it is unhealthy — avoid outdoor activities and wear an N95 mask.
- When is PM2.5 season in Thailand?
- The dry season, roughly December to April. Northern and northeastern Thailand peak in February–April (burning season), while Bangkok is usually worst December–February when the air is still.
- How do I protect myself from PM2.5?
- On high-dust days wear an N95 (or equivalent fine-particle) mask, cut outdoor activity, keep windows closed and run an air purifier indoors. Young children, the elderly, pregnant women and people with lung or heart conditions should take extra care.
- Where does this data come from?
- From the Pollution Control Department's automatic air-quality monitoring network (Air4Thai) — official government open data, updated hourly.
Air-quality data from Air4Thai, Pollution Control Department (government open data). Figures are each station's latest hourly average and may differ from apps using other sensor networks.