High time for war on PM2.5After a week of severe air pollution, the PM2.5 dust in Bangkok and nearby areas gradually receded to safe levels, thanks to an abrupt change in weather patterns, with wind blowing away the particles. Indeed, it has been almost three years since the capital city acknowledged there was a big problem with PM2.5 levels. In November, Bangkok governor Aswin Kwanmuang made a bold announcement that the city would ban lorries with more than six wheels from inner-city areas during the day. City districts with high levels of dust frantically engaged in "big cleaning" as if it were a photo op. That order might have given the image that the Bangkok governor was being tough in trying to reduce PM2.5 levels, despite the fact that construction activities are not the source of PM2.5, but rather the larger and less hazardous PM10 dust particles.

Source: Bangkok Post December 18, 2020 23:37 UTC