April ambient air quality results released in Guiyang

Guiyang published the April ambient air quality results for all districts, county-level cities and counties in the city on May 11. Guanshanhu district ranked first with 97.32 points.

The complete ranking is as follows: Guanshanhu district, Xifeng county, Qingzhen city, Xiuwen county, Baiyun district, Wudang district, Nanming district, Yunyan district, the Guiyang High-Tech Industrial Development Zone, Huaxi district, Guiyang Economic and Technological Development Zone, Kaiyang county.

In April, the air quality standards in each region were met on 100 percent of days. The main pollutant in each region was ozone, and the comprehensive index of ambient air quality was between 2.23 and 2.79.

The monthly average concentration of sulfur dioxide in Guiyang was six micrograms per cubic meter, the monthly average concentration of nitrogen dioxide was 17 mg per cu m, and the monthly average concentration of inhalable particulate matter was 37 mg per cu m.

The daily average concentration of carbon monoxide did not exceed the standard, and the maximum daily ozone concentration for the maximum eight hours did not exceed the standard. The monthly average concentration of fine particles was 21 mg per cu m.