|Air Quality Data for Nonmetallic Inorganic Ions: Nitrate and Sulfate for 1979 from the National Air Surveillance Networks.
Evans, Gary F. ;
Puzak, John C. ;
Frazer, John E. ;
|Environmental Monitoring Systems Lab., Research Triangle Park, NC.
Air pollution ;
Inorganic nitrates ;
Urban areas ;
Air quality data ;
National Air Surveillance Networks
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The National Air Surveillance Networks, which have existed for over twenty years, provide information on air quality for many urban and nonurban locations within the United States. This report summarizes the network data for two nonmetallic inorganic ions (nitrate and sulfate) determined from high volume samples collected during 1979. Concentration values are presented in the form of cumulative frequency distributions. Arithmetic and geometric sample statistics are also reported as are measures of the precision and bias associated with the analytical methods employed. Comparison of the 1979 data with that from previous years in the decade shows that NASN nitrate concentrations summarized on a nationwide basis increased substantially during the 1970's.