Mae Hong Son opts for controlled burning ahead of ban.
With haze continuing to choke many northern provinces yesterday, Chiang Mai University's mobile "Dust Boy" monitors measured "code-red" levels of PM2.5 in several areas of the country's second city. Code red covers levels above 90 micrograms per cubic metre of the most dangerous airborne particles.
A Dust Boy monitor in Muang district's Nong Pa Khrang recorded 135mcg of PM2.5 and an Air Quality Index (AQI) level of 245 - far above the safe limit of 100.
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