Airport Cooperative Research Program Releases Report 84, A Guidebook for Preparing Airport Emission Inventories for State Implementation Plans

The Federal Clean Air Act of 1970, as amended, requires that states identify those areas where the National Ambient Air Quality Standards (NAAQS) are not met for six air contaminants, known as criteria air pollutants. The U.S. Environmental Protection Agency (EPA) has designated such areas as nonattainment areas. A state with a nonattainment area must prepare a State Implementation Plan (SIP) that details the programs and requirements that the State will use in order to meet the NAAQS by the deadlines specified in the Clean Air Act Amendments of 1990. Nonattainment areas that are brought into attainment of the NAAQS are reclassified as maintenance areas.

More than 150 of the nation's commercial service airports are located in EPA-designated nonattainment or maintenance areas for one or more criteria air pollutants. Federal funding or approvals of future airport development projects at these facilities may be affected by policies and regulations contained in the SIP documents that have been prepared for the associated nonattainment or maintenance areas.

On May 7, 2013, the Airport Cooperative Research Program (ACRP) published a guidebook for airport operators and state and local air quality planners describing the development of airport emissions inventories for inclusion in SIP documents. Adrian Jones and Michael Arnold of ESA Airports were members of the research team led by KB Environmental Sciences, Inc. that developed the guidebook on behalf of the ACRP. ACRP Report 84, Guidebook for Preparing Airport Emission Inventories for State Implementation Plans describes the state of the practice in terms of SIP development, contains guidance on how to develop airport emissions inventories, and direction on how to harmonize future airport emissions estimates with aviation activity forecasts. ACRP Report 84 also includes emission inventory and aviation forecasting protocols for airside non-road emissions sources at civilian airports including aircraft, auxiliary power units, and ground support equipment.

ACRP Report 84 is a useful tool and the guidance it contains will help operators of civilian commercial service and general aviation airports and local air quality management agencies to quantify and reduce air pollutant emissions, ultimately enabling the aviation industry to become more sustainable and environmentally friendly.

For more information about the ACRP Report 84, preparing a SIP, or addressing criteria air pollutants at your airport contact Adrian Jones at or 415.896.5900.

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