| Title: | Observing ozone chemistry in an occupied residence |
| Author(s): | Liu Y; Misztal PK; Arata C; Weschler CJ; Nazaroff WW; Goldstein AH; |
| Address: | "State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, 100871 Beijing, China; yingjun.liu@pku.edu.cn. Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, 100871 Beijing, China. Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA 94720. Department of Chemistry, University of California, Berkeley, CA 94720. Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, NJ 08854. International Centre for Indoor Environment and Energy, Technical University of Denmark, Lyngby 2800, Denmark. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720" |
| ISSN/ISBN: | 1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking) |
| Abstract: | "Outdoor ozone transported indoors initiates oxidative chemistry, forming volatile organic products. The influence of ozone chemistry on indoor air composition has not been directly quantified in normally occupied residences. Here, we explore indoor ozone chemistry in a house in California with two adult inhabitants. We utilize space- and time-resolved measurements of ozone and volatile organic compounds (VOCs) acquired over an 8-wk summer campaign. Despite overall low indoor ozone concentrations (mean value of 4.3 ppb) and a relatively low indoor ozone decay constant (1.3 h(-1)), we identified multiple VOCs exhibiting clear contributions from ozone-initiated chemistry indoors. These chemicals include 6-methyl-5-hepten-2-one (6-MHO), 4-oxopentanal (4-OPA), nonenal, and C8-C12 saturated aldehydes, which are among the commonly reported products from laboratory studies of ozone interactions with indoor surfaces and with human skin lipids. These VOCs together accounted for >/=12% molecular yield with respect to house-wide consumed ozone, with the highest net product yield for nonanal (>/=3.5%), followed by 6-MHO (2.7%) and 4-OPA (2.6%). Although 6-MHO and 4-OPA are prominent ozonolysis products of skin lipids (specifically squalene), ozone reaction with the body envelopes of the two occupants in this house are insufficient to explain the observed yields. Relatedly, we observed that ozone-driven chemistry continued to produce 6-MHO and 4-OPA even after the occupants had been away from the house for 5 d. These observations provide evidence that skin lipids transferred to indoor surfaces made substantial contributions to ozone reactivity in the studied house" |
| Keywords: | "Air Pollutants/*chemistry/isolation & purification Air Pollution, Indoor/analysis/prevention & control Aldehydes/chemistry California/epidemiology *Environmental Monitoring Humans Ketones/chemistry Lipids/chemistry Oxidation-Reduction/drug effects Ozone/*;" |
| Notes: | "MedlineLiu, Yingjun Misztal, Pawel K Arata, Caleb Weschler, Charles J Nazaroff, William W Goldstein, Allen H eng Research Support, Non-U.S. Gov't 2021/02/03 Proc Natl Acad Sci U S A. 2021 Feb 9; 118(6):e2018140118. doi: 10.1073/pnas.2018140118" |
