Chiang Mai air quality 'worst in the world'
Chiang Mai was once again the world's most polluted city, with air quality level at 346, the AirVisual application reported at 9.58am on Friday (March 20).
Dust particles smaller than 2.5 microns in diameter ( PM2.5), measured 295.7 micrograms per cubic metre.
The province was followed by Bangladesh capital Dhaka and the Pakistani city of Lahore, with the air quality levels at 214 and 204 respectively.
According to the Air Quality Index, a reading between 0 to 50 is healthy, 51 to 100 is moderate, 101 to 150 is unhealthy for sensitive groups, 151 to 200 is unhealthy, 201 to 300 is very unhealthy, and 301 to 500 is dangerous.
The province was followed by Bangladesh capital Dhaka and the Pakistani city of Lahore, with the air quality levels at 214 and 204 respectively.
According to the Air Quality Index, a reading between 0 to 50 is healthy, 51 to 100 is moderate, 101 to 150 is unhealthy for sensitive groups, 151 to 200 is unhealthy, 201 to 300 is very unhealthy, and 301 to 500 is dangerous.
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