Characterizing population exposures and co-exposures to ozone and PM2.5 for the city of Philadelphia using a source-to-dose framework
S. W. Wang, Q. Sun, A. Chandrasekar, V.M. Vyas, P. Shade, Y.C. Yang, P. G. Georgopoulos (EOHSI, UMDNJ - R.W. Johnson Medical School and Rutgers University)
This paper provides an overview of a modeling study of population exposure to Ozone (O3) and Particulate Matter 2.5 (PM2.5) for the City of Philadelphia and a surrounding area. The study focused on a two-week episode, from July 11, 1999 to July 24, 1999, and employed the consistent source-to-dose modeling framework of MENTOR/OPERAS (Modeling Environment for Total Risk Studies/Ozone and Particles Exposure and Risk Analysis Systems). The MENTOR/OPERAS framework consists of four components needed to estimate popu-lation exposure/dose: (1) calculation of ambient outdoor concentrations, (2) spatiotemporal interpolation for obtaining census-tract level outdoor concentrations, (3) calculation of microenvironmental concentrations to match the corresponding activity patterns, and (4) population dosimetry modeling. This study shows the feasi-bility of developing population exposure assessments to ozone and PM using an integrated and mechanistically consistent approach.