This newspaper, Beijing, August 31 (Reporter Kou Jiangze) The Ministry of Ecology and Environment announced on August 31 the national ambient air quality status from January to July this year: the average number of days with good air quality in 339 cities at the prefecture level and above in the country was 85.3%, a year-on-year increase of 85.3%. The average concentration of PM2.5 was 30 micrograms/cubic meter, a year-on-year decrease of 3.2%; the average concentration of PM10 was 51 micrograms/cubic meter, a year-on-year decrease of 8.9%; the average ozone concentration was 146 micrograms/cubic meter, a year-on-year increase of 4.3% %; the average concentration of sulfur dioxide was 9 micrograms per cubic meter, a year-on-year decrease of 10.0%.
From January to July, the average number of days with good quality in “2+26” cities in Beijing-Tianjin-Hebei and surrounding areas was 62.2%, a year-on-year increase of 0.9 percentage points; the PM2.5 concentration was 43 micrograms/m3, a year-on-year decrease of 2.3%; the average ozone concentration It was 186 micrograms per cubic meter, a year-on-year increase of 2.8%.
The average number of good days in 41 cities in the Yangtze River Delta region was 80.2%, down 6.0 percentage points year-on-year; the PM2.5 concentration was 32 micrograms/m3, up 3.2% year-on-year; the average ozone concentration was 164 micrograms/m3, up 7.9% year-on-year .
The average number of good days in 11 cities in the Fenwei Plain was 59.6%, down 4.5 percentage points year-on-year; the PM2.5 concentration was 45 micrograms/m3, up 4.7% year-on-year; the average ozone concentration was 177 micrograms/m3, down 0.6% year-on-year .