Abstract |
This report represents the first major attempt in the history of the Federal air program to evaluate trends in air quality and emissions on both a national and a regional basis. Based on data from the National Air Sampling Networks, air quality trends are presented for: Total suspended particulates for 1960 through 1971; carbon monoxide, oxides of nitrogen, and oxidants for 1962 through 1971; and, sulfur dioxide for 1964 through 1971. Included is a detailed evaluation of ambient air quality for three Air Quality Control Regions. For the period 1940 through 1970, emissions trends are presented on a national basis only. Air quality data, emissions data, and summaries of monitoring activities are presented for each State and Air Quality Control Region. Specific program areas emphasized are data acquisition and analysis, and trend identification and interpretation. (Author) |