Antioxidants are one of the commonly used additives in plastic products. However,their occurrence and behaviors in air are poorly understood.This research revealed the contamination of a number of plastic additives,including antioxidants,brominated flame retardants,and bisphenol A,in PM,2.5, in Guangzhou,China.As for the antioxidants,only their oxidation and degradation products were found in the PM,2.5,,possibly due to the short atmospheric life of the antioxidants,with total concentrations ranged from 0.64 to 19.3 ng/m,3,.Higher concentrations were found at sites with intensive chemical and plastic manufacturing.Municipal wastewater treatment plant also has a significant contribution to the degradation products of antioxidants in the air.The correlations between concentrations of plastic additives and meteorological factors are largely determined by the physicochemical properties of the pollutants.Surface solar radiation has the greatest effect on the pollutant levels in the particles,which can promote the enrichment of plastic additives with long half-lives.The lifetime average daily dose of inhalation exposure to the plastic additives was relatively higher for the residents living around the chemical and plastic manufacturing.The incremental lifetime cancer risk of inhalation exposure to decabromodiphenyl ether in Guangzhou is under the acceptable risk level(10,-4,) and lower than that in other cities of China.
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Hunan Provincial Center for Disease Control and Prevention
China National Center for Food Safety Risk Assessment
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