title: Particulate reactive oxygen species on total suspended particles - measurements in residences in Austin, Texas.
abstract: The biologically relevant characteristics of particulate matter (PM) in homes are important to assessing human health. The concentration of particulate reactive oxygen species (ROS) was assessed in eight homes and was found to be lower inside (mean ± s.e. = 1.59 ± 0.33 nmol/m3) than outside (2.35 ± 0.57 nmol/m3). Indoor particulate ROS concentrations were substantial and a major fraction of indoor particulate ROS existed on PM2.5(58 ± 10%), which is important from a health perspective as PM2.5can carry ROS deep into the lungs. No obvious relationships were evident between selected building characteristics and indoor particulate ROS concentrations, but this observation would need to be verified by larger, controlled studies. Controlled experiments conducted at a test house suggest that indoor ozone and terpene concentrations substantially influence indoor particulate ROS concentrations when outdoor ozone concentrations are low, but have a weaker influence on indoor particulate ROS concentrations when outdoor ozone concentrations are high. The combination of substantial indoor concentrations and the time spent indoors suggest that further work is warranted to assess the key parameters that drive indoor particulate ROS concentrations.
authors.affiliation: Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX, USA.
authors.forename: S S
authors.identifier: 0000-0003-0224-1740
authors.initials: SS
authors.lastname: Khurshid
authors.affiliation: Department of Civil Engineering, The University of Toronto, Toronto, ON, Canada.|Dalla Lana School of Public Health, Division of Occupational & Environmental Health, The University of Toronto, Toronto, ON, Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Siegel
authors.affiliation: Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Kinney
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D006798:Housing; D006801:Humans; D052638:Particulate Matter / Q000032:analysis*; D017382:Reactive Oxygen Species / Q000032:analysis*; D013781:Texas
chemical_list: D052638:Particulate Matter; D017382:Reactive Oxygen Species
keywords: Homes; Indoor Air Quality; Ozone; Particles; Secondary organic aerosols; Terpenes