Land Use Regression Models of Traffic-Related SVOC Pollutants in an Urban Area with Elevated Prevalence of Pediatric Asthma

摘要

While land use regression models have been commonly used to model inorganic gaseous traffic emission marker pollutants such as nitrogen dioxide (NO_2), the difficulty of deploying equipment to measure SVOCs across a study area has limited the number of LUR models of SVOCs associated with traffic emissions. Deployment of the PDMS sorbent material mounted in PTFE housing case has enabled the measurement of PAHs at 40 sites across the greater Springfield, MA area (～185 km~2). The objective of this study was to assess concentrations and determinants of PAHs traffic emission pollutants in Springfield. The PDMS bars were deployed for five consecutive weekdays (Monday to Friday) at a sites across the urban and suburban area under summer conditions. PDMS sorbent material was thermally desorbed and analysed by gas chromatography time-of-flight mass spectrometry to determine time-integrated exposure measures. Detectable concentrations were measured for six PAHs (isophorone, benzene,l-bromo-4-phenoxy, benzene, hexachloro, pyrene, Benzo[b]fluoranthene, Benzo[k]fluoranthene) at 20 or more of the sample locations. LUR models will be developed using built environment and land use characteristics and compared with NO_2 LUR model of the area using ambient exposure data collected through deployment of 40 Ogawa passive sampler badges. Future work will extrapolate these models to estimate exposures for children with asthma.