Urban Air Toxics Monitoring Report (UATMP) 2006 Final Report. Volume I: Main Content

摘要

This report presents the results and conclusions from the ambient air monitoring conducted as part of the 2006 Urban Air Toxics Monitoring Program (UATMP)Ca program designed to characterize the magnitude and composition of potentially toxic air pollution in, or near, urban locations. The 2006 UATMP included 59 monitoring sites that collected 24-hour air samples, typically on a 6- or 12-day schedule. Forty-five sites sampled for 60 volatile organic compounds (VOC) and/or 15 carbonyl compounds. Five sites sampled for 80 speciated nonmethane organic compounds (SNMOC) and an additional five sites sampled for total NMOC (TNMOC). Six sites sampled for semivolatile compounds (SVOC). Twenty sites sampled for 11 metals and 23 sites sampled for hexavalent chromium. Overall, over 180,000 ambient air concentrations were measured during the 2006 UATMP. This report uses various graphical, numerical, and statistical analyses to put the vast amount of ambient air monitoring data collected into perspective. Not surprisingly, the ambient air concentrations measured during the program varied significantly from city to city and from season to season. The ambient air monitoring data collected during the 2006 UATMP serve a wide range of purposes. Not only do these data characterize the nature and extent of urban air pollution close to the 59 monitoring sites participating in this study, but they also indicate some trends and patterns that may be common to all urban environments. Therefore, this report presents some results that are specific to particular monitoring locations and presents other results that are apparently common to urban environments. The results should ultimately provide additional insight into the complex nature of urban air pollution. The final data are also included in the appendices to this report.