IL17A and schizophrenia: Two studies (Wei et al., 2022; Gao et al., 2021) reported that PM exposure may increase the risk of relapse in schizophrenia, through different underlying mechanisms: decreased antioxidant system function, especially the level of T-AOC (Total Antioxidant Capacity) (Wei et al., 2022) and imbalance of inflammatory cytokine IL-17 (Gao et al., 2021).