title: Spatial and temporal variability of ambient air toxics data.
abstract: This paper summarizes information on the spatial and temporal variability of selected air toxics pollutants collected on a national basis primarily for a period encompassing 1990-2003. Spatial information on pollutant concentrations is characterized in terms of within-city and between-city variability. Temporal information is summarized as diurnal and seasonal variability and in multiyear trends. The information on variability is presented in the framework of a larger need for systematic documentation of information on air toxics pollutants to assess progress in air pollution control programs.
authors.affiliation: National Oceanic and Atmospheric Administration/Atmospheric Sciences Modeling Division, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA. Touma.Joe@epa.gov
authors.forename: Jawad S
authors.initials: JS
authors.lastname: Touma
authors.forename: William M
authors.initials: WM
authors.lastname: Cox
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Tikvart
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000517:prevention & control*; D002947:Cities; D019992:Databases as Topic; D004282:Documentation; D004784:Environmental Monitoring; D006801:Humans; D008962:Models, Theoretical; D012621:Seasons; D013997:Time Factors; D014481:United States; D014484:United States Environmental Protection Agency
chemical_list: D000393:Air Pollutants