Based on the environmental air quality monitoring data released by the Ministry of Ecology and Environment of the People's Republic of China and by using investigation and quantitative analysis methods,the overall characteristics and spatial differences of air quality in the five cities of Xi'an,Weinan,Xianyang,Tongchuan,and Baoji in the Guanzhong area were analyzed in this study.The results showed the following.(1) The particulate pollutants generally exceeded their standards significantly,with PM_2.5 and PM₁₀ exceeding the standards of 91% and 77%,respectively.(2) The air pollution has obvious seasonality,as the primary pollutants in winter are PM_2.5 and PM₁₀ and the major summer pollutant is O₃.(3) Air pollution in the Guanzhong area is affected by human activities such as topography,weather conditions and industrial emissions,heating,construction and road dust,and automobile exhaust.The air pollution has similarities and shows some differences.