Hanoi had the highest PM2.5 air pollution index in October

The Ministry of Natural Resources and Environment has announced a report on air quality in some big cities in October.   

According to the ministry, the air quality in October was better than September.

However, in October, some cities still experienced days with the high level of PM2.5. For instance, Ha Long and Hue cities saw one day each, Danang and HCM City had two days each, Viet Tri had six days and Hanoi witnessed up to 8 days.

PM2.5 was the major cause of air pollution in the surveyed cities, meanwhile, other pollutants namely NO2, O3, CO and SO2 were basically within permitted levels.

The report indicated that the high PM2.5 was often from 9 pm and 7 am of the next day.

In October, Hanoi saw the highest level of PM2.5, while Hue was at the lowest. DTinews

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