Severe pollution hits Southeast Asia.
In early April 2026, Southeast Asia experienced significant air pollution due to wildland and agricultural fires. These fires produced a mix of pollutants, including aerosol particles and gases such as carbon monoxide, nitrogen oxides, and sulfur oxides. These pollutants contribute to ground-level ozone and haze, severely reducing visibility and impacting health. According to NASA Earthdata, the Atmospheric Infrared Sounder (AIRS) on NASAâs Aqua satellite detected high concentrations of carbon monoxide over Laos and northern Vietnam on April 4, 2026. The region's dry conditions, preceding the rainy monsoon season, have exacerbated the situation, providing ample fuel for fires. The haze has been persistent due to weather patterns that prevent dispersion, affecting countries like Thailand, Vietnam, Cambodia, and Myanmar.