The average PM2.5 levels throughout the city was 26 micrograms per cubic metre (µg/m3), lower than the country’s standard of 37.5µg/m3 over a three-hour average (5am to 7am).
PM2.5 refers to dust particles 2.5 micrometres or less in diameter, long-term exposure to which is linked with chronic diseases including lung and heart problems.
Major sources of PM2.5 include traffic emissions, factories, forest fires, and burning of harvest leftovers.
Ten districts that reported the highest levels of PM2.5 were: Phasi Charoen (35), Thonburi (34), Lak Si (32.7), Phra Khanong (32.2), Prawet (31.8), Bang Rak (30.8), Bangkok Noi (30.7), Nong Khaem (30.7), Pom Prap Sattru Phai (30) and Khlong Sam Wa (29.9).
Air quality can be checked daily on the AirBKK application, www.airbkk.com, Line Alert, as well as the Facebook page of the BMA’s Environment Department.