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Cell death increases after PM2.5 combined with UVB. (A) Cell viability decreased after PM2.5 combined with UVB; (B,C) apoptosis increased after PM2.5 combined with UVB. Each experiment was performed in triplicate and data are presented as mean ± SD. One-way ANOVA and Dunnett’s Multiple comparison test were used to analyze the data (*P<0.05, **P<0.01, ***P<0.001).
