However, photochemical pollutants, primarily dominated by O 3 , have shown an increasing trend, with the annual daily maximum 8 h average O 3 concentrations increasing at a rate of 2.19 ppb yr −1 over 2014–2020 [ 3 , 4 ].
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Spatial-Temporal Characteristics, Source Apportionment, and Health Risks of Atmospheric Volatile Organic Compounds in China: A Comprehensive Review.
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