| Summary: | Using the hourly monitoring data of pollutants from 16 automatic atmospheric monitoring stations in eastern Jilin Province from 2015 to 2020, this paper analyzed the temporal and spatial distribution laws of CO, SO<sub>2</sub>, NO<sub>2</sub>, PM<sub>10</sub>, PM<sub>2.5</sub>, and O<sub>3</sub> in eastern Jilin Province. At the same time, the regional transport pathways of pollutants were analyzed using the hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) model; the potential source contribution function (PSCF) analyzed the potential source area of PM<sub>2.5</sub>. Finally, the “weekend effect” of CO, NO<sub>2</sub>, PM<sub>2.5</sub>, and O<sub>3</sub> was analyzed. The results showed that the six pollutants showed a downward trend year by year. The concentrations of O<sub>3</sub>, PM<sub>10</sub>, and PM<sub>2.5</sub> were higher in northwest Jilin, and the concentrations of SO<sub>2</sub> and CO were higher in southwest Jilin. Except for CO, the seasonal variation of pollutants was pronounced. Except for O<sub>3</sub>, most pollutants had the highest concentration in winter. Hourly variation analysis described that SO<sub>2</sub> and O<sub>3</sub> had only one peak in a day, and the other four pollutants showed “double peak” hourly variation characteristics. The study area was mainly affected by the airflow pathway from northwest and southwest. The weight potential source contribution function (WPSCF) high-value area of PM<sub>2.5</sub> was northwest and southwest. O<sub>3</sub> showed a “negative weekend effect”, and NO<sub>2</sub> and CO showed a “positive weekend effect”.
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