BANGKOK (ANN/THE NATION) – On Thursday, 21 out of the 50 districts in Bangkok, Thailand were discovered to have PM2.5 levels exceeding the safety threshold of 37.5 micrograms per cubic metre. This “orange” level of PM2.5, referring to particulate matter with a diameter less than 2.5 micrometres, poses significant health risks. When PM2.5 pollution reaches […]