Browsing by Subject "Deposition velocity"
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Item Effects of scented personal care products on ozone reactivity with human building occupants(2018-05) Fritz, Hagen Earl; Corsi, Richard L.The concentration of ground-level ozone in many cities is projected to increase in the coming years. The greater the concentration of ground-level ozone, the more ozone will enter building spaces through infiltration and ventilation. Once indoors, ozone reacts with other gas-phase pollutants, building materials, and human skin lipids. Studies in portable classrooms suggest that reactions between ozone and human skin lipids contribute more to the overall reduction in bulk indoor ozone concentration than previous research indicates. We hypothesize that the increased ozone uptake to occupants is due to the prevalence of body sprays like colognes and perfumes noted during field measurements in high school classrooms. Cleaning products, air fresheners, body sprays, and deodorants contain high concentrations of unsaturated volatile organic compounds called terpenes because terpenes, which are known for their pleasant-smelling fragrances. Ozone is a respiratory irritant and known asthmagen, but by-products from ozone/terpene reactions can be potentially more harmful. Terpenes, along with molecules present on indoor furnishings and human skin lipids, represent major sinks for indoor ozone. In this study, the terpene compositions of multiple, common male body sprays are characterized. From this analysis, one particular body spray was chosen based on the concentration of terpene and terpene-related species it contained. The body spray's effects on the ozone deposition velocity to cotton clothing and human subjects was tested in a stainless steel environmental chamber by comparing the steady-state ozone concentrations with and without the body spray applied. The average ozone deposition velocity to humans without the body spray applied was found to be 16.2 m/s. When the body spray was applied, the value actually decreased to 14.7 m/s. This research shows that scented body sprays might not noticeably alter clothing's or a person's reactivity with ozone. However, results from portable classrooms and a test chamber indicate that humans might be more reactive in the presence of ozone than previous studies have found, particularly at higher AERs that reduce transport resistance for ozone interactions with humans in indoor spaces