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Levels of malondialdehyde (MDA) in the olfactory bulb, cerebellum, hippocampus, and cortex after 3 and 6 months of exposure to particulate matter with an aerodynamic diameter of < 2.5 μm (PM2.5; exposure group). Levels of MDA had significantly increased in the olfactory bulb, hippocampus, and cortex after 6 months of PM2.5 exposure compared to the control (high-efficiency particulate air; HEPA). * p < 0.05
