In the first quarter, the quality of air and water ecological environment continued to improve

　　339 City PM2.5 concentration decreases, and the proportion of excellent section of water quality rises

　　In the first quarter, the quality of air and water ecological environment continued to improve

　　(Reporter Zhou Yan) The average PM2.5 concentration of 339 prefecture -level and above cities in the country fell by 6.5%. Among the 3,641 countries, the proportion of excellent section of the water quality of the water quality rose by 0.8 percentage points.The reporter recently learned from the Ministry of Ecology and Environment that in the first quarter of this year, the overall air quality and water ecological environment quality of the country have continued to improve.

　　In terms of air quality, in the first quarter, the average PM2.5 concentration of 339 prefecture -level and above cities across the country was 43 micrograms/cubic meter, a decrease of 6.5%year -on -year.The year -on -year is the same.The proportion of excellent air quality days was 83.6%, an increase of 3.5 percentage points year -on -year; the proportion of the number of days of severe and above was 2.4%, a year -on -year decrease of 0.9 percentage points.

　　Among them, the average concentration of PM2.5 in 13 cities in the “2+36” cities and Fenwei Plain in Beijing, Tianjin, Hebei and surrounding areas decreased by 7.2%and 16.7%year -on -year, respectively, and the proportion of excellent days increased by 10.9%and 13.1%year -on -year.However, the average PM2.5 concentration of 31 cities in the Yangtze River Delta increased by 12.8%year -on -year, and the proportion of excellent days decreased by 4.6 percentage points year -on -year.

　　In terms of quality and environmental quality of the water ecological environment, in the section of the surface water assessment of 3641 countries, the proportion of excellent water quality (Class I ~ III) was 89.9%, an increase of 0.8 percentage points year -on -year;EssenceThe main pollution indicators are chemical oxygen demand, high permanganate index and total phosphorus.