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Chiang Mai air still world's worst

Hazy Chiang Mai, seen from Doi Suthep. And billboards around the province forbidding any outdoor fires have been no help. (File photo)

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Chiang Mai's air quality was ranked among the world's worst for a third consecutive day Wednesday as haze continued to choke the North.

The air quality index at noon Wednesday was logged at 265, the highest in the world at that moment, according to the AirVisual App, a well-known online air monitoring site. The level of PM 2.5 was recorded at 214 microgrammes per cubic metre (μg/m³).

Such a level is considered harmful to health. The World Health Organisation (WHO) caps the acceptable level of PM2.5 at 25 μg/m³, and the threshold for Thailand's Pollution Control Department (PCD) is 50 μg/m³.

Chiang Mai provincial officials were spraying water in a desperate attempt to reduce the haze. The attempt barely helped as the air quality remained at harmful levels the whole day.

The levels prompted Chiang Mai University to cancel classes for Wednesday and Thursday.

The city was among many towns in nine provinces covered by haze caused by a combination of forest fires, open burning, haze from Laos and Myanmar as well as weather conditions.

Officials were monitoring the haze situation, air quality and trying to prevent forest and farm fires. They were also seeking the cooperation of local residents not to burn garbage or agricultural waste.

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Vocabulary:

barely : only just; almost not - ??????????

desperate : in an extreme or worried way - ????????????

harmful : causing damage or injury to somebody/something, especially to a person's health or to the environment - ???????????,???????

haze : water, smoke or dust in the air that makes it difficult to see clearly - ????????

log : to put information in an official record or write a record of events - ????????

monitor : to regularly check someone/something - ??????? ??????????????

threshold : the level or point at which you start to experience something, or at which something starts to happen - ???????????????????????????????????????

waste (noun): the useless part that is thrown away after something is used - ???, ???????, ????????????????, ????????????????????????????, ????????????

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