Three provinces in the North, including Chiang Mai, faced PM2.5 levels higher than the standard safe levels for health.
Officials attempted to reach the origins of the smog, including forest fires and burn-offs in order to tackle the haze. In Chiang Mai, the high concentration of PM 2.5 - dust particles with diameter less that 2.5 microns per square metre - that can affect the human respiratory system reached 63 microns per square metre, prompting Chiang Mai residents to adjust their daily lifestyles, including switching to indoor exercises.
from Asia
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