[Objective] To examine the intervention effect of a fish oil product on acute lung injury induced by intratracheal instillation of fine particulate matter with median aerodynamic diameter <2.5 μm(PM2.5). [Methods] Thirty-six male SD rats were randomly divided into six groups, including solvent(corn oil) control group, fish oil(0.60 g/kg) control group, PM2.5 exposure(8.0 mg/kg) group, and PM2.5 plus fish oil groups at low, middle, high doses of fish oil(0.15, 0.30, 0.60 g/kg). The PM2.5 exposure group and t...