Heavy air pollution of fine particulate matter (PM2.5) shrouds a street in Bangkok, Thailand, 17 January 2021. Fine particulate matter (PM2.5), which can cause serious health issues, spiked to unhealthy levels in Thailand's capital with the amount of fine particulate matter, of 2.5 microns or less in diameter, exceeding 100 in Bangkok and surrounding areas, according to the Pollution Control Department. World Health Organization (WHO) guidelines put the safe concentration of PM2.5 at 25 micrograms per cubic meter in a 24 hour period, or 12 micrograms in a year.
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