Air Pollution, Extreme Heat Raise Health Concerns Across Laos

This Week

Laos is facing a double challenge as hazardous air pollution coincides with a period of extreme heat, prompting authorities to issue nationwide health warnings.

Air quality has deteriorated significantly across most provinces, with fine particulate matter (PM2.5) exceeding safe limits and posing serious risks to public health.

The Forestry Department under the Ministry of Agriculture and Environment detected 16,395 fire hotspots as of 1 April.

The widespread occurrence of hotspots has been largely attributed to human activities, including slash-and-burn agriculture, the burning of grassland for livestock, and fires set in forest areas to facilitate the collection of non-timber forest products.

Seasonal haze has been further intensified by transboundary smoke carried by prevailing winds from neighboring countries, contributing to thick smog in northern provinces and Vientiane Capital.

On 4 April, the Department of Meteorology and Hydrology recorded PM2.5 concentrations in the “very unhealthy” range in several parts of the country.

Monitoring stations in Luang Prabang registered levels of 170 micrograms per cubic metre with an Air Quality Index (AQI) of 220. Similar readings were observed in Vientiane Capital and Champasak Province, where PM2.5 levels reached 158 micrograms per cubic metre and AQI values exceeded 200.

Such conditions significantly increase health risks, particularly for children, the elderly, pregnant women, and individuals with underlying medical conditions. Experts associate long-term exposure to PM2.5 with cardiovascular disease, stroke, lung cancer, and chronic respiratory illnesses.

Health authorities are urging the public to closely monitor daily air quality updates and take preventive measures, including wearing PM2.5-rated masks, reducing outdoor activities during periods of heavy pollution, improving indoor air quality, and seeking medical attention if symptoms such as persistent coughing or shortness of breath occur.

Efforts to reduce emissions during the peak burning season remain essential to mitigating the impact of air pollution.

Extreme Heat Warning

Compounding these concerns, Laos has issued a weather alert warning of very hot conditions nationwide from 6 to 10 April.

The Department of Meteorology and Hydrology reports that a strong hot air mass combined with predominantly westerly winds will result in sustained high temperatures across the country, with the possibility of thunderstorms, lightning, and isolated hail in some areas.

Temperatures will reach between 33 and 37 degrees Celsius in the northeastern provinces, 35 to 41 degrees in the northwest, 36 to 42 degrees in central regions, and up to 41 degrees in southern provinces, while Vientiane Capital is forecast to experience temperatures ranging from 38 to 41 degrees Celsius.

Authorities have called on local administrations, organizations, and communities to remain vigilant as the extreme heat increases the risk of wildfires and heat-related illnesses such as heatstroke.

Residents are advised to stay hydrated, avoid prolonged exposure to direct sunlight, and continue monitoring official weather forecasts from the Department of Meteorology and Hydrology.

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