Changes in the PM2.5 concentration from 2015 to 2017 in Bijie City, Guizhou Province, China

Atmospheric environmental problems have received more and more attention. Research of PM2.5 has become the core issue of atmospheric environment research. This paper takes the PM2.5 data of the Bijie City from 2015 to 2017 as the research object, and investigates the trend in PM2.5 concentration. The PM2.5 concentration generally showed a decline trend, and the air quality was relatively good. The PM2.5 concentration in Bijie City was basically maintained within the secondary concentration limit of the air environmental quality. The PM2.5 concentration in Bijie City has a weekend effect, and the concentrations on the weekends were slightly higher than those on weekdays. This study can provide a scientific basis for the prevention and control of air pollutants in the Bijie City. (paper)