Air pollution in Xi'an, China, has been studied from 2013 to 2019 to see how environmental regulations affect air quality. Suburban areas had higher levels of PM10, PM2.5, and CO, while urban areas had more NO2 and O3. Overall, air pollution levels decreased over the years due to environmental management. Different pollutants peaked at different times of day and year, with PM10 highest in spring, summer, and autumn, and PM2.5 highest in winter. PM10 and PM2.5 were strongly correlated, as were PM and NO2, and NO2 and CO. Both local and regional environmental regulations were linked to lower levels of PM10, SO2, and CO. This research can help improve air quality management in the region.