Figure 4: Effects of Alpinia officinarum on total superoxide dismutase (A) and malondialdehyde (B) in lung tissue of particulate matter-induced mice. AO: Alpinia officinarum; PM: particulate matter; LD: low dose; MD: medium dose; HD: high dose. All values are expressed as mean±SD (n=10). ###P<0.001 compared with control group. **P<0.01, ***P<0.001 compared with the PM group.