Description: <A href="https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7B6D412E16-523A-4466-AE04-09EAEF7C16F3%7D">Full Metadata</A> This web service layer displays areas identified in the U.S. where annual particulate matter(PM10) levels have not met the National Ambient Air Quality Standards (NAAQS) established in 1987 for particulate matter (PM10) and have been designated "nonattainment” areas (NAA)". The data are updated weekly from an OAQPS internal database. However, that does not necessarily mean the data have changed. This layer is drawn at all scales.
Definition Expression: N/A
Copyright Text: U.S. EPA Office of Air and Radiation (OAR) - Office of Air Quality Planning and Standards (OAQPS)