Air pollution at ‘orange level’

Unclear view: Buildings shrouded in haze in Bangkok. — AFP

Air pollution in Bangkok rose to the “orange” level (starting to affect health), signalling the start of the so-called PM2.5 season.

Levels of particulate matter 2.5 micrometres or less in diameter (PM2.5) ranged from 24.3 to 49.8 micrograms per cubic metre (μg/m³) across the city, according to the Pollution Control Department (PCD) on Tuesday .