September, the provincial capital of the air quality in an invigorating autumn climate, excellent work can not be. October 18th, the news from the China environmental monitoring station, in 74 cities nationwide assessment in September, Xining air quality ranked fortieth. It is worth mentioning that, Xining and other 14 cities to get good air quality rate, which is following the July air quality excellent rate of up to 100%, in September, Xining air quality excellent rate of up to 100%.
people can not help but ask, in September Xining air quality excellent rate of 100%, ranking in the country after why? In this regard, the Xining Municipal Environmental Protection Bureau staff explained that the national air quality rankings based on AQI (air quality index). This index takes into account the concentration levels of 6 major air pollutants, such as PM2.5, PM10, ozone and so on, which is a quantitative evaluation index, which can comprehensively reflect the overall situation of air quality in a city. Due to the different concentration limits of the 6 kinds of pollutants in the AQI evaluation, the pollutants will be converted into the air quality index AQI. Although the Xining daily air quality, but the number of days a day or AQI limits are higher than that of other city, natural air quality index is higher than that of other city.
just past September, the total number of days of urban air quality monitoring in Xining 30 days, the total effective monitoring of the number of days is 30 days, the number of days to reach the standard ratio of 100% (30 days). Compared with the same period last year, an increase in the number of days a good day, PM10, PM2.5 monthly average showed a downward trend. In October, Xining entered the winter heating period, the atmospheric environment will again be coal, the surrounding rural straw burning pollution test, Xining Municipal Environmental Protection Bureau to remind the public, such as the discovery of straw burning behavior, can call 12369 environmental hotline complaints.