
Fine particles pollution worsens in the north.
Despite being in safe levels, the fine particle index in Hanoi was higher than in other urban areas. The air quality index on Hang Dau Street fell to an unsafe level on August 27 while other stations reported normal to good air quality. The air quality in Tan Mai Ward, Hoang Mai District, was good for a whole month.
The air quality in the northern region often worsens starting from September, especially fine particle pollution. There may be heavy waves of air pollution.