Description: Regions representing the geographic extent of areas in Colordo that were previously estimated to be out of compliance with the United States Environmental Protection Agency's (EPA) air quality guidelines for particulate matter. These areas are currently in compliance and their status is designated "Attainment/Maintenance", but because of their age, conformormity no longer applies and they are eligible to be redesignated.
Description: Regions representing the geographic extent of areas in Colorado that were previously estimated to be out of compliance with the United States Environmental Protection Agency's (EPA) air quality guidelines for carbon monoxide. These areas are currently in compliance and their status is designated "Attainment/Maintenance", but because of their age, conformormity no longer applies and they are eligible to be redesignated.
Description: Regions representing the geographic extent of areas in Colordo that were previously estimated to be out of compliance with the United States Environmental Protection Agency's (EPA) air quality guidelines for particulate matter. These areas are currently in compliance and their status is designated "Attainment/Maintenance".
Description: Regions representing the geographic extent of areas in Colordo that were previously estimated to be out of compliance with the United States Environmental Protection Agency's (EPA) air quality guidelines for particulate matter. These areas are currently in compliance and their status is designated "Attainment/Maintenance", but because of their age, conformormity no longer applies and they are eligible to be redesignated.
Description: Shows boundaries for the Colorado 8-hour Ozone Nonattainment Area.
Copyright Text: Originally created by Arvilla Kirchhoff at NFR. Modified by Josh Pendleton (DRCOG) and Gary Aucott (CDOT) to better reflect the sub-area boundary along the north line of Township 3 and the lat/long coordinates in the upper left corner of the area. Modified again by CDOT in 2022 to reflect the addition of all of Weld County.
EPA website information: https://www3.epa.gov/airquality/greenbook/ancl.html