Comprehensive Program Plan

Air Dispersion Modeling Program

Air Dispersion Modeling is an evaluation technique used to characterize the pollution resulting from the operation of a source or group of sources. Ohio Revised Code (ORC) 3704.03 provides the Director with the authority to require modeling in the adoption of rules and in the issuing of permits. The federal Clean Air Act requires modeling in conjunction with the classification of air quality areas, the preparation of state implementation plans (SIPs) and in the review of new sources.

The Division of Air Pollution Control (DAPC) air modeling staff performs original modeling studies and reviews reports of modeling studies submitted by other parties. With few exception, U.S. EPA-approved models are applied using protocols that follow the U.S. EPA Air Modeling Guideline. Typical reasons that modeling studies are performed are:

  1. The development of emission standards for the SIP
  2. The determination of increment consumption of a new source during prevention of significant deterioration reviews 
  3. The evaluation of adverse impact of an air toxics source during an enforcement action

The air modeling staff interacts with engineering staff members to gather source-related input data, new source review and air toxics staff to relate the findings of their studies and air enforcement personnel to provide support for enforcement actions. The staff works closely with facility representatives in the verification of input data, the interpretation of results and the consideration of any alternative control strategies that may be indicated.

For further information, please contact Jennifer Van Vlerah.

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