Multiphase chemistry plays a vital role in the atmosphere and indoor environments. Reactive oxygen species (ROS) play a central role in adverse health effects of air pollutants. Respiratory deposition of fine air particulate matter can lead to the formation of ROS in epithelial lining fluid, potentially causing oxidative stress and inflammation. Secondary organic aerosols (SOA) account for a large fraction of fine particulate matter, but their role in adverse health effects is unclear. We quantify and compare the ROS yields and oxidative potential of various types of SOA in water and surrogate lung fluid. Multiphase reactions of ozone with human skin oils impact indoor air quality by depleting ozone and forming volatile and semi-volatile organic compounds, which can be respiratory and skin irritants. We investigate the impact of clothing on indoor air composition and human exposure by integrating indoor chemistry modeling over a wide range of different spatial and temporal scales, from sub-nanometer to tens of meters and from sub-nanosecond to days. The kinetic multi-layer model is developed to explicitly resolve mass transport and chemical reactions in the clothing, at the skin, and in the gas phase, and reproduces experimental measurements of ozone and major squalene oxidation products upon ozone exposure to soiled and laundered clothing. Our kinetic modeling approach, combined with molecular dynamics simulations, was also applied to kinetic experiments of adsorption of limonene on to SiO2.<br/>

Multiphase chemistry of reactive oxygen species in indoor environments and human surfaces

2019 Fall National Meeting

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