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Summary of Colorado Air Quality Regulations

Index to Complete Air Quality Regulations 



This regulation establishes ambient air quality standards for the state of Colorado and dictates monitoring procedures and data handling protocols. It also defines nonattainment area boundaries for locations in the state which historically have violated federal and state air quality standards. In addition, the regulation contains the state's urban visibility standard and sets emission budgets for nonattainment areas.


This regulation defines specific requirements concerning air quality control strategies and contingency measures for non-attainment areas in the state.

Regulation No. 1 sets forth emission limitations, equipment requirements and work practices (abatement and control measures) intended to control the emissions of particles, smoke and sulfur oxides from new and existing stationary sources. Control measures specified in this regulation are designed to limit emissions into the atmosphere and thereby minimize the ambient concentrations of particles and sulfur oxides.


Regulation No. 2 sets standards for allowable odor contaminants for different land-use areas in the state and outlines control measures that can be taken to bring violators into compliance.


Regulation No. 3 requires air pollution sources to file Air Pollutant Emission Notices. It also requires that new or modified sources of air pollution - with certain exemptions - obtain pre-construction permits. Very large facilities also are required to obtain operating permits.


Regulation No. 4 requires new stove and fireplace inserts to meet federal certification in specified areas of the state.


Regulation No. 5 was repealed effective February 2005.

Regulation No. 6 sets standards of performance for specific new stationary sources in Colorado. The regulation is designed to bring new sources into compliance with the U.S. Environmental Protection Agency's (EPA) New Source Performance Standards. In addition, the regulation sets standards for new industries that are unique to Colorado for which the Environmental Protection Agency (EPA) has not yet set standards.


Regulation No. 7 controls the emissions of volatile organic compounds, primarily in the Denver metro area. It sets standards and mandates controls for specific types of volatile organic compound sources.


Regulation No. 8 sets forth specific work practices, emission control requirements and standards for hazardous air pollutants.


Regulation No. 9 applies to all open burning activities throughout the state to control smoke and emissions from such fires. The regulation sets forth requirements for permitting including prescribed fires, controlled burns, and significant users of prescribed fires.


Regulation No. 10 defines the criteria the Colorado Air Quality Control Commission (AQCC) uses to evaluate the consistency between state air quality standards/objectives, and transportation planning and major construction activities across the state, as defined in state implementation plans. 


Regulation No. 11 requires automobile emission inspection and maintenance programs to be implemented in specified areas of the state for gasoline-powered on-road vehicles. These programs apply to businesses, industry and the general public. 


Regulation No. 12 defines the state's diesel-powered vehicle emission inspection and maintenance program for on-road vehicles.


Regulation No. 13 requires the use of oxygenated fuels in gasoline-powered motor vehicles in Colorado's Automobile Inspection and Readjustment program areas, except Colorado Springs, from Nov. 1 through Feb. 7.


Regulation No. 15 identifies the requirements to control emissions of ozone-depleting compounds from both stationary and mobile sources.


Regulation No. 16 sets specification standards for street sanding material and street sweeping practices in the Automobile Inspection and Readjustment program area, and the Denver metro fine particle non-attainment area.


Regulation No. 17 was repealed effective August 2002.


Regulation No. 18 sets forth the requirement for implementing the state's acid rain program. This program is adopted by reference from the federal program found in 40 C.F.R., Part 72 as in effect on Jan. 6, 1994.


Regulation No. 19 defines the requirements for certifying lead abatement professionals and work practice measures.