‘Dust dome’ to blame for city’s haze

The drop in air quality across Bangkok over the past week is caused by an urban “dust dome” over the city, which formed as low atmospheric pressure and high-rise buildings trapped dust and other pollutants from the burning of agricultural waste, says Natural Resources and Environment Minister Varawut Silpa-archa.

The haze which has shrouded Bangkok over the past four to five days wasn’t just caused by the build-up of microfine PM2.5 dust, as the concentration of larger PM10 pollutants and greenhouse gases has also soared.

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