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In order to obtain the chemical composition characteristics and source apportionment of PM_2.5 in a western industrial region of Jinan, manual sampling and analysis of PM_2.5 in Pingyin County was conducted during 2019. The results showed that the total concentration of 29 species of PM_2.5 was 53.8 μg·m⁻³. The NO₃⁻ concentration (14.6 ± 14.2 μg·m⁻³) was the highest, followed by OC (9.3 ± 5.5 μg·m⁻³), SO₄²⁻ (9.1 ± 6.4 μg·m⁻³) and NH₄⁺ (8.1 ± 6.8 μg·m⁻³). Concentrations of OC, NO₃⁻ and SO₄²⁻ were highest in winter and lowest in summer. The concentration of NH₄⁺ was highest in winter and lowest in spring. The annual SOR and NOR were 0.30 ± 0.14 and 0.21 ± 0.12, respectively. SO₂ emission and conversion ratio was highest in winter, leading to the highest SO₄²⁻ concentration. SO₂ emission in summer was low, but the conversion ratio was high. NOR in winter and autumn were close and higher than spring and summer. The high NOR in autumn caused a higher NO₃⁻ concentration compared with that in spring and summer. The average concentration of SOC during 2019 was 2.8 ± 1.9 μg·m⁻³, accounting for 30% of OC. The PMF results showed that coal emission accounted for 36.5% of PM_2.5 concentration, followed by mobile sources (32.6%), industry emission (17.4%), dust emission (7.1%) and other emissions (6.4%).