In short
- Warning issued by the Ministry of Public Health on 6 November 2026; heightened vigilance runs until May 2027.
- 40 provinces are classed as high risk, including Bangkok, Chiang Mai and Chiang Rai.
- About 16 million people are considered vulnerable: people with respiratory or heart conditions, young children, pregnant women and older adults.
- Bangkok bars four-wheeled trucks that fail its Green List checks from November 2026 to March 2027.
What to do
- 1Check the Safe Zone app before going out to find dust-free rooms and pollution clinics near you.
- 2Wear an N95 mask outdoors rather than a surgical one, and keep windows and doors shut on bad days.
- 3Ask your hotel whether the room has a HEPA-filtered air purifier before you book.
- 4If you have asthma or a heart condition, consult a pollution clinic on site or by telemedicine instead of waiting.
What has the ministry warned?
On Friday 6 November 2026, Thailand's Ministry of Public Health said a developing Super El Niño could bring prolonged drought and heavier PM2.5 pollution than in previous years, according to the Bangkok Post. Deputy permanent secretary Dr Sarawut Boonsuk asked for preventive measures and close attention from now until May 2027.
Figures cited by the newspaper put PM2.5 levels above the standard in more than 60 provinces between 2024 and 2026. Forty provinces are treated as high risk, including Bangkok. Thai media named Chiang Rai, Chiang Mai and Bangkok as the most critical zones.
The warning covers the coming months in the north and in Bangkok. The month-by-month weather guide sets out what to expect region by region over the same period, and which coasts stay clear of the northern haze.
Who is most at risk?
About 16 million people in Thailand are classified as vulnerable, according to the ministry. The group includes people with respiratory disease, allergies, heart disease and cardiovascular conditions, young children, pregnant women and older adults. Travellers with asthma or a heart condition fall into the same category and should build days around air quality rather than the other way round.
What changes in Bangkok?
Bangkok governor Chadchart Sittipunt said the city will hold back vehicles that are not on its Green List during the haze season, which runs from now until March 2027. Four-wheeled trucks that have not qualified under the checklist will not be allowed in, the Bangkok Post reported. The measure targets trucks: no restriction on cars or rental scooters has been announced.
What practical tools are available?
The ministry launched a Safe Zone application that locates dust-free rooms and pollution clinics in real time and maps groups at risk of respiratory and cardiovascular disease. Pollution clinics receive patients on site and online through telemedicine, so a doctor can be consulted without travelling.
For the 2027 haze season, the ministry said it wants spending aligned across several local bodies — governors' offices, provincial disaster agencies, municipal authorities and the National Health Security Office's regional funds.
For masks, hospitals and insurance, see the health and vaccines guide; for overall risk levels in the country, read Is Thailand safe; for what to pack, use the packing list.
Travelling soon? Plan around it
Build a day-by-day Thailand route that keeps flexible days where the weather and transport are uncertain.
FAQ
Questions
Should I cancel a trip to Chiang Mai or Bangkok?
No. The ministry issued a health warning and Bangkok a truck restriction. No airport closure, flight cancellation, visa change or travel ban has been announced.
Which dates matter?
Heightened vigilance runs until May 2027. Bangkok's truck restriction applies from November 2026 to March 2027.
What does not change for travellers?
Visa, entry and border rules are unaffected, and there is no general restriction on tourist traffic or on domestic flights.
Sources
- Bangkok Post · Super El Niño effect could worsen PM2.5 next year · Nov 6, 2026
- Chiang Rai Times · Super El Niño May Worsen PM2.5 Air Pollution Next Year · Nov 7, 2026
We cross-check each story against official pages and several media, and rewrite it in our own words for travellers.
