Code of Colorado Regulations · Air Quality Standards, Designations and Emission Budgets

Code of Colorado Regulations · Air Quality Standards, Designations and Emission Budgets

AIR QUALITY STANDARDS, DESIGNATIONS AND EMISSION BUDGETS 5 CCR 1001-14

This document sets Colorado's ambient air quality standards, designates nonattainment and attainment/maintenance areas across the state, and sets emission budgets for attainment/maintenance areas. It also includes a visibility standard for the AIR program area and a State Only carbon monoxide standard within the Eisenhower Tunnel.

I.B.1.

This is a State Only sulfur dioxide ambient air quality standard. The actual concentration of sulfur dioxide at any receptor site no greater than five meters above ground level in Colorado shall not exceed 700 micrograms per cubic meter (or 0.267 parts per million by volume at one atmosphere and 25 degrees Celsius), three-hour maximum, more than once in any twelve-month period. The analytical methods must be any reference method in 40 CFR Part 50, Appendix A; alternative methods may be used if listed by EPA as a reference or equivalent method under 40 CFR Part 53. Concentrations are reported as micrograms per cubic meter or parts per million at 25 degrees Celsius and one atmosphere (1013 millibars).

III.A.

Sections III.A through III.E are repealed. The classification table that follows lists Colorado's PM10 and ozone nonattainment and attainment/maintenance areas. For PM10, seven areas are designated attainment/maintenance with effective dates ranging from July 31, 2000 to November 25, 2005: Denver Metro (all of Denver, Jefferson, and Douglas Counties; Boulder County excluding Rocky Mountain National Park; and the auto inspection portions of Adams and Arapahoe Counties), Steamboat Springs, Pagosa Springs, Telluride/Mt. Village/San Miguel County, Aspen/Pitkin County, Cañon City/Fremont County, and Lamar (city limits as of July 30, 1991). For ozone, the Denver 1-Hour Ozone area (effective October 11, 2001) is attainment/maintenance and covers Jefferson and Douglas Counties, the Cities and Counties of Denver and Broomfield, Boulder County excluding Rocky Mountain National Park, Adams County west of Kiowa Creek, and Arapahoe County west of Kiowa Creek. The Denver Metro Area/North Front Range 8-Hour Ozone area (effective November 20, 2007) is nonattainment and includes Adams, Arapahoe, Boulder (with part of Rocky Mountain National Park), Douglas, Jefferson, Denver, and Broomfield, plus southern portions of Larimer and Weld Counties defined by specific latitude/longitude lines. The Denver Metro PM10 attainment/maintenance designation does not affect the application of certain provisions in Regulations Number 1 and Number 3, which continue to apply as if the area were nonattainment for PM10.

III.M.

This is a heading for a map (not reproduced in the available text) showing the boundary of the Denver Metro Area/North Front Range 8-Hour Ozone Nonattainment Area under the 2008 Ozone NAAQS. The classification, effective date, and specific boundary description are not provided in this row.

III.N.

This is a heading for a map (not reproduced in the available text) showing the boundaries of the Denver Metro Area/North Front Range and northern Weld County 8-Hour Ozone Nonattainment Area for the 2015 Ozone NAAQS; no classification, effective date, or specific county boundaries are given in this row.