Abstract: Based on the 2019 Ambient Air Quality Report publicly released by the Ministry of Ecology and Environment,and the Department of Ecology and Environment of Shandong Province,the statistical software SPSS25. 0 was used to analyze the monthly average concentration of six indicators,namely PM_{2. 5},PM₁₀,SO₂,NO₂,CO,O₃ and the comprehensive air quality index ((Referred to as Isum). The correlation between the primary pollutant PM_{2. 5} and PM₁₀,SO₂,NO₂,CO,O₃,Isum was explored. The multiple regression equations of Isum and PM_{2. 5},PM₁₀,SO₂,NO₂,CO,O₃ were established. The difference in monthly average concentration values between Tai'an City and neighboring cities Jinan City and Jining City by t test were tested. The P value and t value were calculated to evaluate the homogeneity of air quality in Taishan District,Daiyue District,and High-tech Zone of Tai'an City.In accordance with the "Technical Methods for Formulating Local Air Pollutant Discharge Standards" (GBT3840-91),the atmospheric environmental capacity of Tai'an City was calculated. The results would provide scientific and accurate theoretical support for the air pollution prevention.