Chiang Mai’s Mountain Views Vanish as Smoke Fills the Valleys

Northern Thailand’s historic city of Chiang Mai is experiencing severe air pollution as smoke from agricultural and forest fires blankets the region, obscuring mountain views and raising health concerns among residents.

Severe Haze Obscures Chiang Mai’s Signature Landscapes

Chiang Mai, Thailand’s second-largest city, is renowned for its panoramic views of surrounding mountains. However, recent satellite imagery shows these vistas have been increasingly obscured by haze. On April 22, 2026, NASA’s Terra satellite captured images revealing how smoke partially concealed valleys and ridges typically visible under clearer conditions.

The city lies within a network of narrow valleys in northern Thailand’s highlands, where seasonal fires have darkened skies during the dry season, particularly in March and April. In recent decades, clear skies have develop into less common as smoke pollution intensifies.

Health Impacts Rise as Pollution Reaches ‘Very Unhealthy’ Levels

Air quality in Chiang Mai has deteriorated to hazardous levels, with PM2.5 concentrations classified as “very unhealthy” as of Wednesday morning, April 22, 2026. Residents report physical symptoms from the pollution.

One local resident, Tirayut Wongsantisuk, shared that his six-year-old daughter has experienced nosebleeds and developed rashes due to the haze. Two of his daughters have suffered frequent nosebleeds, prompting the family to consider relocating during peak pollution season.

A coconut seller in Chiang Mai described the haze as so severe it leaves her nose burning and bloodied, stating, “It’s suffocating… It feels like you’re trapped in the smoke constantly.”

Fire Activity Surges Across Northern Thailand

The pollution crisis stems from a significant increase in fire activity. Satellite data showed a record number of 4,750 hotspots across Thailand on Tuesday, April 21, 2026, mostly in forested areas. By early Friday, April 24, 2026, Chiang Mai province alone recorded 136 hotspots according to provincial command centre data from the Suomi-NPP satellite.

Fire detections began increasing in February 2026 and became more widespread through March and April. Even as small numbers of fires were detected throughout January, activity has intensified as the region approaches its typical fire season peak.

Agricultural Burning and Wildfires Drive Pollution Crisis

The haze results from both seasonal agricultural practices and natural wildfires. Farmers traditionally burn off fields between November and March before sowing fresh seeds. Dry conditions spark wildfires in forests and farmlands.

Research indicates that biomass burning is a major contributor to poor air quality in northern Thailand during the dry season. One estimate suggests about 70 percent of fine particulate matter (PM2.5) in Chiang Mai in April comes from biomass burning, with smaller contributions from vehicles, power plants, industry, and charcoal burning for cooking and heating.

No Immediate Relief in Sight

Forecasters warn that temperatures could climb to 39°C with no rain expected to help clear the air. Fire activity typically peaks in March and fades by May as seasonal rains increase, but current conditions suggest prolonged haze without significant precipitation.

Local residents who have lived in Chiang Mai their entire lives describe this as the worst pollution they have ever experienced. For many who operate outdoors daily, there is no choice but to endure the hazardous conditions while earning a living.

The ongoing crisis highlights the recurring challenge of balancing agricultural traditions with public health and environmental protection in northern Thailand’s increasingly fire-prone landscapes.