This report presents national and regional trends in air quality from 1984 through 1993 for particulate matter, sulfur dioxide, carbon monoxide, nitrogen dioxide, ozone and lead. Air quality trends are also presented for 89 metropolitan areas. Both national and regional trends in each of these pollutants are examined. National air quality trends are also presented for both the National Air Monitoring Sites (NAMS) and other site categories. In addition to ambient air quality, trends are also presented for annual nationwide emissions. These emissions are estimated using the best available engineering calculations; the ambient levels presented are averages of direct measurements. International comparisons of air quality and emissions are contained in this report. The topics of air toxins and visibility are also addressed. This report also includes a section called Air Quality Status of Metropolitan Areas. Its purpose is to provide interested members of the air pollution control community, the private sector and the general public with greatly simplified air pollution information for the single year 1993. Air quality statistics are presented for each of the pollutants for all MSAs with data in 1993.

  • Corporate Authors:

    Environmental Protection Agency

    Technical Support Division
    Research Triangle Park, NC  United States  27711
  • Authors:
    • Curran, T
    • Fitz-Simons, T
    • Freas, W
    • Hemby, J
    • Mintz, D
    • Nizich, S
    • Parzygnat, B
    • Wayland, M
  • Publication Date: 1994-10


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 157 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00675254
  • Record Type: Publication
  • Report/Paper Numbers: EPA 454/R-94-026
  • Files: TRIS
  • Created Date: Mar 10 1995 12:00AM