Children's microenvironmental exposure to PM<sub>2.5</sub> and ozone and the impact of indoor air filtration.

TitleChildren's microenvironmental exposure to PM2.5 and ozone and the impact of indoor air filtration.
Publication TypeJournal Article
Year of Publication2020
AuthorsKK Barkjohn, C Norris, X Cui, L Fang, L He, JJ Schauer, Y Zhang, M Black, J Zhang, and MH Bergin
JournalJournal of Exposure Science & Environmental Epidemiology
Start Page971
Pagination971 - 980
Date Published11/2020

<h4>Background</h4>In highly polluted urban areas, personal exposure to PM<sub>2.5</sub> and O<sub>3</sub> occur daily in various microenvironments. Identifying which microenvironments contribute most to exposure can pinpoint effective exposure reduction strategies and mitigate adverse health impacts.<h4>Methods</h4>This work uses real-time sensors to assess the exposures of children with asthma (N = 39) in Shanghai, quantifying microenvironmental exposure to PM<sub>2.5</sub> and O<sub>3</sub>. An air cleaner was deployed in participants' bedrooms where we hypothesized exposure could be most efficiently reduced. Monitoring occurred for two 48-h periods: one with bedroom filtration (portable air cleaner with HEPA and activated carbon filters) and the other without.<h4>Results</h4>Children spent 91% of their time indoors with the majority spent in their bedroom (47%). Without filtration, the bedroom and classroom environments were the largest contributors to PM<sub>2.5</sub> exposure. With filtration, bedroom PM<sub>2.5</sub> exposure was reduced by 75% (45% of total exposure). Although filtration status did not impact O<sub>3</sub>, the largest contribution of O<sub>3</sub> exposure also came from the bedroom.<h4>Conclusions</h4>Actions taken to reduce bedroom PM<sub>2.5</sub> and O<sub>3</sub> concentrations can most efficiently reduce total exposure. As real-time pollutant monitors become more accessible, similar analyses can be used to evaluate new interventions and optimize exposure reductions for a variety of populations.

Short TitleJournal of Exposure Science & Environmental Epidemiology