Air quality in Hà Nội in May was better than in previous months. — Photo phapluatdansinh.vn
HÀ NỘI — Air quality in big cities dramatically improved last month, said the Ministry of Natural Resources and Environment’s Environment Department.
According to the results from 18 automatic environment monitoring stations in cities of Hà Nội, Việt Trì, Hạ Long, Huế, Đà Nẵng, Nha Trang and HCM City, most urban areas across the country had 24-hour parameters of PM2.5 within the permitted threshold of Vietnamese standards.
The number of days with good air quality index (AQI) during 24 hours was higher than in previous months.
Hà Nội was always more polluted than other cities but still had up to 90 per cent of the days with good AQI.
However, in some areas of Phạm Văn Đồng, Hàng Đậu and Minh Khai streets, the AQI exceeded the threshold.
The department said that May is the beginning of the rainy season so the air quality in many provinces and cities, especially Hà Nội and the northern region, improved compared to the dry season's moths.
However, according to the National Centre for Hydro-meteorological Forecasting, the number of hot days this summer would be higher than normal.
The prolonged heat wave would have significant impacts on air quality, especially in urban areas, the centre said. — VNS