The report presents national and regional trends in air quality from 1985 through 1994 for particulate matter, sulfur dioxide, carbon monoxide, nitrogen dioxide, ozone and lead. Air quality trends are also presented for 90 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. International comparisons of air quality and emissions are contained in the report. The topics of air toxics and visibility are also addressed. The report also includes a section call Selected Metropolitan Area Trends. Air quality statistics are presented for each of the pollutants for all Metropolitan Statistical Areas with data in 1994.