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Road proximity influences indoor exposures to ambient fine particle mass and components

Huang, Shaodan ; Lawrence, Joy ; Kang, Choong-Min ; Li, Jing ; Martins, Marco ; Vokonas, Pantel ; Gold, Diane R ; Schwartz, Joel ; Coull, Brent A ; Koutrakis, Petros

Environmental Pollution, December 2018, Vol.243, pp.978-987 [Peer Reviewed Journal]

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  • Title:
    Road proximity influences indoor exposures to ambient fine particle mass and components
  • Author/Creator: Huang, Shaodan ; Lawrence, Joy ; Kang, Choong-Min ; Li, Jing ; Martins, Marco ; Vokonas, Pantel ; Gold, Diane R ; Schwartz, Joel ; Coull, Brent A ; Koutrakis, Petros
  • Language: English
  • Subjects: Indoor Exposure ; Fine Particle (Pm2.5) ; Metal Elements ; Traffic ; Road Proximity ; Engineering ; Environmental Sciences ; Anatomy & Physiology
  • Is Part Of: Environmental Pollution, December 2018, Vol.243, pp.978-987
  • Description: Exposure to traffic-related PM mass and its components can affect human health. Meanwhile, indoor concentrations are better exposure predictors as compared to outdoor concentrations because individuals spend the majority of their time indoors We estimated the impact of traffic emissions on indoor PM mass and its species as a function of road proximity in Massachusetts. A linear regression model was built using 662 indoor samples and 580 ambient samples. Analysis shows that indoor exposures to traffic-related particles increased dramatically with road proximity. We defined relative concentration decrease, ( ), as the ratio of the indoor concentration at perpendicular distance in meters from the closest major road to the indoor concentration at 1800 m from the major road. (13) values for PM mass and Black Carbon (BC) were 1.3 (95%CI: 1.4, 1.6) and 2.1 (95%CI: 1.3, 2.8) for 12 roads, and 1.3 (95%CI: 1.2, 1.4) and 1.2 (95%CI: 1.1, 1.3) for 3 roads. ( ) values were also estimated for Fe, Mn, Mo, Sr and Ti for 12 roads, and Ca, Cu, Fe, Mn, Mo, Ni, Si, Sr, V and Zn for 3 roads. ( ) values for species associated mainly with brakes, tires or road dust (e.g., Mn, Mo and Sr) were higher than others. For 12 roads, (13) values for Mn and Mo were 10.9 (95%CI: 0.9, 20.9) and 6.5 (95%CI: 1.4, 11.5), and ranged from 1.3 to 2.1 for other species; for 3 roads, (13) values for Mn, Mo and Sr were 1.9 (95%CI: 1.1, 2.9), 1.8 (95%CI: 1.1, 2.4), and 8.5 (95%CI: 5.9, 10.9), and ranged from 1.2 to 1.6 for others. Our results indicate a significant impact of local traffic emissions on indoor air, which depends on road proximity. Thus road proximity which has been used in many epidemiological studies is a reasonable exposure metric. This paper investigated the influence of road proximity on the concentration of indoor PM and its components and can be helpful for the assessment of health risks associated with indoor exposure.
  • Identifier: ISSN: 0269-7491 ; E-ISSN: 1873-6424 ; DOI: 10.1016/j.envpol.2018.09.046