Several schools across the capital have been forced to close as PM2.5 pollution across the city continued to increase to unhealthy levels.
Nong Khaem district in particular reported very high concentrations of PM2.5 pollutants, reaching 77.8 microgrammes per cubic metre (µg/m³) at 12.30pm on Monday -- over twice the limit for "safe" exposure over a 24-hour period set by the Pollution Control Department, at 37.5µg/m³.
