Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 6, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2018140118
Keywords
ozonolysis; indoor; residential; squalene; exposure
Categories
Funding
- Alfred P. Sloan Foundation [2016-7050, 2019-11412]
- Alfred P. Sloan Foundation Postdoctoral Fellowship [201514166]
- 111 Project [B20009]
Ask authors/readers for more resources
This study explored indoor ozone chemistry in a house in California with two adult inhabitants, finding that multiple VOCs exhibited clear contributions from ozone-initiated chemistry indoors. These chemicals include compounds commonly reported from ozone interactions with indoor surfaces and human skin lipids. Additionally, the study observed that ozone-driven chemistry continued to produce specific VOCs even after the occupants had been away from the house for several days.
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available