March 9th, 10, Xining affected by the wind and sand weather, PM2.5 and PM10 concentrations in the urban areas pushed up again, the primary pollutants in the air PM10, air quality index of more than 500, is a serious pollution. In the past February, Xining air quality days only 5 days, air quality excellent rate of only 17.9%, compared with the same period last year, the number of days to reduce the number of fine days of 23.
in February, the Xining air quality index was good for 5 days, the good rate was 17.9%. Among them, 15 days of mild pollution, accounting for the total number of days in the month of the number of days; moderate pollution for 5 days; severe pollution for 2 days; serious pollution for the next 1 days, which is following the January, Xining air quality days only once again for a period of only 5 days.
February Xining air quality days why only 5 days? During the Spring Festival, the setting off fireworks, travel vehicles increased, pushing up the concentration of PM2.5 and PM10 in February. Monitoring data show that in February 9th (EVE) 22 pm the next day at 1 pm, February 24th (fifteen month) from 20 pm to 23 PM, the concentration in the downtown area of Xining PM2.5 and PM10 at the same time to reach the peak, the air quality index of more than 500, severe pollution. (author: Zhao Junjie)