BANGKOK – The air pollution crisis has gotten worse with unsafe levels of fine particulate matter (PM2.5) spreading across the capital and nearby areas. By late January 2026, PM2.5 often sits above national safety limits, leading to health alerts and louder calls for tougher action. A day earlier, on January 28, the Bangkok Air Quality Information Center reported an average PM2.5 level of 55.6 µg/m³. Why Bangkok Air Pollution Keeps Coming BackThe haze covering Bangkok is packed with PM2.5, tiny particles that can move deep into the lungs and even enter the bloodstream. Bangkok’s fight with air pollution shows how hard PM2.5 is to control without steady action.