典型气态污染物对臭氧引发形成室内二次有机气溶胶的影响

People spend more than 80% of their time indoors, and the indoor air quality is closely related to human's health. Terpenoids, as an important category of volatile organic compounds (VOCs), are ubiquitous in indoor environment. These compounds are reactive, and are prone to oxidation by ozone to form secondary organic aerosols (SOA), which can pose adverse effects on human health. Previous studies demonstrated that the co-existent gaseous pollutants can influence the yields, particle size distribution, and other physical properties of indoor SOA. However, as far as we know, there are only limited studies in regarding to the effects of these parameters on the formation pathway and chemical properties (including particle surface property, the chemical components of reactive oxygen species and water soluble organic compounds etc.) of indoor SOA, which is ultimately needed for health assessment and management. We propose a three-year study to investigate the mechanism regarding the effect of coexistent gaseous pollutants on the formation of SOA from ozonolysis of typical indoor terpenoids. The variations of surface properties, reactive oxygen species and water-soluble organic compounds of SOAs formed under different indoor conditions will be characterized. Marker compounds for SOA formed with different co-existent gaseous pollutants will be identified. The experimental results obtained in this study are essential to evaluate the potential effects of indoor SOA on human health, and to develop efficient indoor air pollution control technology. It is expected that the results from this study can serve as a baseline database for indoor air quality control and management in China.

现代人类超过80%的时间在室内度过，室内空气质量的优劣将直接影响人体健康。萜类化合物是一类广泛存在于室内环境中的挥发性有机物（VOCs），它极易与臭氧反应生成对人体健康危害更大的二次有机气溶胶(SOA)，而室内的典型气态污染物（氨气、二氧化硫和氮氧化物等）影响SOA产率、物理性质及微观化学性质的机制有待深入研究。本项目拟采用环境实验舱评价典型气态污染物对室内SOA形成途径的影响，通过表征产物SOA的粒径分布、表面化学性质、活性氧类和水溶性有机物等组分的含量等，阐明指示SOA化学成分的特征物质，促进室内典型气态污染物影响臭氧引发形成SOA机制的深入认知，为室内污染物控制和人体健康效应研究提供基础数据和理论支持。

室内环境中一次排放的污染物之间的相互作用而形成的二次污染物，引起了国内外学者的广泛关注，是目前室内空气质量研究的前沿之一。本课题采用环境模拟舱，研究了氨气对室内典型萜类化合物（d-柠檬烯）与臭氧反应生成SOA的影响，通过表征不同反应条件下生成的SOA的粒径分布、表面化学性质等理化性质，揭示了典型气态污染物影响臭氧引发形成SOA机制，通过开展动物体内实验，研究了二次有机气溶胶人对体暴露的炎症效应。研究结果为深入理解室内污染物的特征及潜在的健康效应提供了丰富的基础数据，对有效的室内空气质量控制提供了科学数据支撑。