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Ozone (O₃) can cause oxidative stress in plants and humans. Catechin is an antioxidant that enriches tea and can probably increase O₃ tolerance in plants. To investigate the mechanism of catechin to alleviate O₃ stress in plants, Zamiocalcus zamiifolia (an efficient plant for O₃ phytoremediation) was sprayed with 5 mM catechin and was used to expose O₃ (150-250) under long-term operation (10 cycles). We investigated whether exogenous catechin could enhance O₃ removal and alleviate O₃ stress through a balanced redox state in plants. Z. zamiifolia sprayed with catechin exhibited higher O₃ removal (80.27±3.12%), than Z. zamiifolia without catechin (50.03±2.68%). O₃ in the range of 150-250 ppb led to stress in plants, as shown by an increased malondialdehyde content (MDA) and salicylic acid (SA). Whereas under the presence of O₃, exogenous catechin could maintain the MDA content and inhibit SA …