The Pollution Control Department is warning residents of Bangkok and its neighbouring provinces to brace for a drop in air quality, as changing wind patterns on Wednesday and Thursday are expected to trap ultra-fine dust particles over the city.
Siwaporn Rangsiyanon, the department’s deputy spokesperson, said air quality in the capital and its vicinity has improved over the past several days, due to tighter controls on open-air burning and vehicle emissions.
A change in wind direction also helped clear the smog from the city, she said.
According to the department, 25 provinces in the North and Northeast reported PM2.5 — particulate matter measuring less than 2.5 microns across — levels of over 50 microgrammes per cubic metre (µg/m³) on Monday.
In the North, the concentration of fine dust pollutants hovered between 34-73µg/m³, while in the Northeast, the…
