Analysis of Variation Characteristics of Air Quality and Particulate Matter Concentration at Jinsha Atmospheric Background Station

Based on the PM_2.5 and PM₁₀ mass concentration data from 2007 to 2018, and the reactive gas data from March 2019 to June 2019 from Jinsha National Atmospheric Base Station, which is a representative station in Central China, this study evaluated the overall air quality in Central China and the variation characteristics of particulate concentration and analyzed its influencing factors. The results showed that daily maximum and average values of particulate matter concentrations of CO, SO₂, NO and NO₂ reached the first-class standard, but daily average values of O₃, PM_2.5 and PM₁₀ exceeded the national air quality standards of 10.6%, 18%, and 17%, respectively. The annual variations of particulate matter concentrations presented an upward trend from 2007 to 2013 and a downward trend from 2013 to the present. This study also found that the source of particulate matter is partly affected by wind directions and wind speeds.