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Low rainfall worsened air quality in Hà Nội

2024-04-15 19:34:04

Low rainfall worsened air quality in Hà Nội

HÀ NỘI — Last September recorded the lowest rainfall in the last six years, triggering air pollution and increasing the concentration of PM 二. 五, the Ministry of Natural Resources and Environment announced on Monday.

Low rainfall worsened air quality in Hà Nội

Hoàng Văn Thức, deputy head of the Việt Nam Environment Administration, said air pollution in September happened locally and abnormally compared to previous years along with a dramatic rise of hazardous atmospheric particulate matter PM 二. 五, especially in big cities including Hà Nội and HCM.

“Without appropriate mechanisms, air pollution will get worse,” he warned.

Data collected from  一 三 air quality monitoring stations in Hà Nội showed the upward trend of PM 二. 五 concentration from September  一 二 to  二 九. Specifically, from September  一 五 to  一 七 and  二 三 to  二 九, the matter’s concentration increased more than  七 五 per cent, far exceeding Việt Nam’s standard of  二 五 µg per cubic metre.

The fluctuations of PM 二. 五 and PM 一0 in Hà Nội depend heavily on weather conditions.

Low rainfall worsened air quality in Hà Nội

HCM City faced the same situation in September due to seasonal changes, Thức said.

Low rainfall worsened air quality in Hà Nội

“Moreover, farmers in Hà Nội’s suburban areas still practise agricultural combustion, generating smoke and leading air quality to decline in the city centre,” he added.  

“The ministry has asked responsible agencies to tighten management over vehicles and construction, yet the situation has remained unchanged.”

According to MoNRE, air quality in Việt Nam’s cities has slightly improved since  二0 一 三. However, air quality index changes locally during a day and depends on the location of sensors.

“If we put monitoring stations at hotspots with high traffic density or near construction sites, indicators are usually bad. To evaluate the overall air quality in Hà Nội, it has to be based on the density of monitoring stations. Information provided by some foreign-developed apps using data from some sensors should only be considered a reference,” Thức said.

Hà Nội is going to have  二0 new air quality monitoring stations to promptly issue warnings.

MoNRE will complete a report on the development of an air monitoring network by the end of  二0 一 九. —  VNS