Seriously harmful levels of ultrafine dust, three times the safe limit, were reported in Greater Bangkok on Tuesday morning, while most of Thailand was blanketed with unsafe smog.
The Geo-Informatics and Space Technology Development Agency reported at 8am that red levels (seriously harmful to health) of particulate matter 2.5 micrometres and less in diameter (PM2.5) ranged from 78.8 to 116.4 microgrammes per cubic metre (µg/m³) of air in Bangkok and 19 provinces.
The government-set safe threshold for PM2.5 is 37.5µg/m³ in Thailand. There are 76 provinces.
The highest level, 116.4µg/m³, was recorded in Samut Sakhon west of Bangkok, followed by 108.9 in Samut Songkhram, 104.7 in Bangkok, 102.8 in Nonthaburi and Samut Prakan and 101.4 in Nakhon Pathom.
Source: Bangkok Post