Beijing, May 23 (Xinhua) - quality of air and water in China improved from January to April, according to a report by the Ministry of Ecology and Environment of China <. p style = "margin: 3px 0px 15px"> The report showed that 81.2 percent of the quality of surface water Class I to III qualified (good quality of water) in the first four months, up to 6.2 points percentage compared to the same period last year, while class V decreased by 4.1 percentage points year on year to 1.4 percent

. quality of surface water is divided into five classes in the country, with Class I being. the best

for large rivers, including the Yangtze River and the Yellow River, 84.5 percent of the water quality is classified Class I to III, up 7.2 percentage points year -on-year, and 1.2 percent were classified as Class V, down 4.9 percentage points year on year

. The percentage of days with good air qual ity was 84.8 percent in 337 cities at and above the prefecture level in January-April, an increase of 5 percentage points year on year. The average concentration of PM2.5 (air particles) was 42 micrograms per cubic meter in January-April, 12.5 percent year by year

. Among the cities, Haikou, Hainan province, Lhasa, Tibet and Lishui, Zhejiang Province ranked the top three for a good quality of the air in the first four months. End

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