Environmental Protection Agency
EPA's (Guideline on Air Quality Models (Guideline) addresses the regulatory application of air quality models for assessing criteria pollutants under the Clean Air Act. In today's action we propose to make several additions and changes to the Guideline. We recommend two new dispersion models, AERMOD and CALPUFF, for adoption in appendix A of the Guideline. AERMOD would replace the Industrial Source Complex (ISC3) model in many assessments that now use it; AERMOD also would apply to complex terrain. CALPUFF would become a recommended technique for assessing long-range transport of pollutants and their impacts on Federal Class I areas. We revise two existing models: ISC3, by incorporating a new downwash algorithm (PRIME) and renaming the model ISC-PRIME, and the Emissions Dispersion Modeling System (EDMS), by incorporating improved emissions and dispersion modules. We make various editorial changes to update and reorganize information, and remove obsolete models (CDM, RAM and UAM).
Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Part 51 [AH-FRL-6536-3] RIN 2060-AF01 AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule. SUMMARY: EPA's ( Guideline on Air Quality Models ( Guideline ) addresses the regulatory application of air quality models for assessing criteria pollutants under the Clean Air Act. In today's action we propose to make several additions and changes to the Guideline. We recommend two new dispersion models, AERMOD and CALPUFF, for adoption in appendix A of the Guideline. AERMOD would replace the Industrial Source Complex (ISC3) model in many assessments that now use it; AERMOD also would apply to complex terrain. CALPUFF would become a recommended technique for assessing long-range transport of pollutants and their impacts on Federal Class I areas. We revise two existing models: ISC3, by incorporating a new downwash algorithm (PRIME) and renaming the model ISC-PRIME, and the Emissions Dispersion Modeling System (EDMS), by incorporating improved emissions and dispersion modules. We make various editorial changes to update and reorganize information, and remove obsolete models (CDM, RAM and UAM). DATES: The period for comment on these proposed changes to the Guideline closes on July 20, 2000. We plan to hold a public hearing on the proposed changes in Summer 2000. The specific date and time will be announced in a separate document published in the Federal Register . ADDRESSES: We have established an official record for this rulemaking u…
Other Federal Register documents from the same docket.
Citation: 65 FR 21506
