Haze conditions are still severe in Northern Thailand

Haze conditions are still severe

PM2.5 readings across Chiang Mai and northern Thailand are staying in the danger zone, with official monitors reporting spikes well above Thailand’s daily standard of 37.5 µg/m³ and some readings hitting 409 µg/m³ in early April. Smoke from forest fires, agricultural burning and trapped valley haze is still hanging over the region and NASA imagery on April 22 showed the plume plainly, so this isn’t a short-lived wobble, it’s a real air-quality crisis.

The government’s alerts remain active and the problem has spread beyond Chiang Mai, with 39 provinces flagged on April 14. Weirdly enough, the worst stretch lines up with the dry-season burn period, which makes the air stay bad longer because the weather won’t clear it out.

Nomads, expats and travelers are taking the hit

Remote workers in Chiang Mai are feeling it first, honestly, because the haze cuts into outdoor time, closes windows and turns a normal workday into an indoor lockdown. Children, older adults and anyone with asthma or allergies are the most exposed, but even healthy travelers are reporting eye irritation, sore throats, nosebleeds and shortness of breath.

This is hurting the local nomad scene, too. Cancellations around Songkran, slower tourism and more respiratory complaints in expat circles all point to the same thing, Chiang Mai is still livable, but not comfortably so and that matters if you’re planning to stay through late April.

What to do before you head outside

Wear an N95 outdoors, keep windows shut and run a high-grade air purifier indoors, because the air outside isn’t just unpleasant, it’s unhealthy in red-zone conditions. Avoid hard exercise, check real-time AQI before moving around the city and if symptoms get worse, seek medical help rather than hoping it passes.

If you see active burning, report it through 1362, 1567 or 1784 and keep an eye on local disaster notices, since some districts are already using emergency aid like mobile medical units. For broader travel context, check our visa updates and read our full Thailand guide for the complete picture.