CHIANG MAI, THAILAND – PM2.5 fine dust levels exceeded national standards in 50 provinces, raising health concerns and leaving northern Thailand in a critical condition.
PM2.5 exceedances reported in 50 provinces
According to recent reports, PM2.5 values in 50 provinces were measured above the applicable guideline levels yesterday. Large parts of the country were therefore affected by elevated fine dust pollution.
PM2.5 refers to particularly fine particles with a diameter of no more than 2.5 micrometres that can penetrate deep into the respiratory tract. Such levels were regularly recorded and published in air quality reports in Thailand.
Health risks linked to fine dust
Increased PM2.5 concentrations could impair health, especially among sensitive groups. These included people with respiratory or cardiovascular diseases, older persons and children.
Fine dust could intensify irritation of the airways and promote symptoms such as coughing or shortness of breath. Authorities and health agencies typically pointed to precautions during such periods, such as reducing physical activity outdoors.
Northern Thailand remained in a “critical” state
The report underlined that the situation in northern Thailand continued to be described as critical. In the region, particularly strong pollution peaks occurred frequently during the dry season.
Northern Thailand was repeatedly affected by smog episodes, which could be intensified by weather conditions and regional emission sources. In such situations, air quality often improved only slowly over several days.
Why PM2.5 keeps returning as a problem
Fine dust pollution arose from various sources, including traffic, industry and combustion processes. During the dry season, pollutants could accumulate more easily when there was little wind and rainfall.
Cross-border air pollution could also play a role when smoke and particles from neighbouring regions moved into certain parts of the country. Such effects were repeatedly discussed in Southeast Asia in connection with seasonal smog conditions.
What “above standard” actually means
The report referred to values “above the standard”, meaning levels higher than the defined limit or guideline values used to assess air quality. Such exceedances were often communicated in categories that could range from “moderate” to “hazardous to health”.
For the population, it was crucial how high the concentrations were and how long they persisted. The longer a pollution phase lasted, the more important protective measures and reliable information on the current air situation became.
Public experiences and expectations
People across Thailand were invited to share how they experienced the current PM2.5 situation in their own provinces and whether they noticed health effects or restrictions in everyday life.
They were also asked what measures they expected from authorities and policymakers to get recurring smog phases better under control and to discuss their experiences and proposals for improvement.