These web pages are not intended to be taken as EPA policy. EPA will issue guidance on boundaries for 8-hour ozone nonattaimnemt areas in the future. Maps and web pages are on a whole-county basis. The detailed city and township boundaries were not used since the emissions are on a county bases and the sources are not identified by township. Since ozone is seen over a large area, it did not seem necessary to present detail below the county level.
Some counties have two MSAs within their boundaries.
The air quality reports for the 8-hour ozone standard are currently being developed. The ozone monitoring sites will almost always be out of data because states and local agencies are constantly adding and moving various sites. As a result, some monitoring sites that are on the air quality data summaries will not be on the maps and some sites on the maps may not have current air quality data. The List of Nonattainment Areas is a list of designated nonattainment areas as of October 1999. There are no designated 8-hour ozone nonattainment areas at this time.