Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Meteorological Potential for Urban Air Pollution in the Contiguous United States.
Author Holzworth, George C. ;
CORP Author National Air Pollution Control Administration, Washington, DC.
Year Published 1970
Stock Number PB82-240292
Additional Subjects Air pollution ; Urban areas ; Mathematical models ; Meteorology ; United States ; Concentrations(Composition) ; Boundary layers ;
Library Call Number Additional Info Location Last
NTIS  PB82-240292 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 26p
This study delineates some general but important features of the meteorological potential for air pollution in small and large cities throughout the contiguous United States. The potential is evaluated by means of a simple model of dispersion over urban areas in which theoretical concentrations are a function of mixing height, wind speed, and city size (along-wind distance across city). Mixing height and wind speed data are derived for mornings and afternoons from five years of surface and upper air measurements at 62 National Weather Service stations. Mean annual values of mixing height and wind speed as well as median annual and upper decile annual values of X/Q for 10- and 100-km cities are presented in the form of isoplethed maps. The X/Q maps show how theoretical concentrations vary between morning and afternoon, with city size, with frequency of occurrence, and from place to place. In addition, the potential for episodes with limited dispersion conditions lasting at least two days is evaluated objectively and depicted on a map by the total number of episode-days in five years.