Resources for Permit Applicants

Federal Land Mangers’ Interagency Guidance for Nitrogen and Sulfur Deposition Analyses (11/16/2011)
FLAG: Phase 1 Report —Revised (2010) (11/10/2010)
FLAG: Response to Public Comments on Revised Phase 1 Report (2010) (11/10/2010)
Historic Guidance on Nitrogen and Sulfur Deposition Analysis Thresholds (1/3/2002)
Historic FLAG 2000 Phase I Report (12/29/2000)

See FLAG products above
National Acid Deposition Program – This website provides monitoring data for atmospheric chemical deposition at more than 300 sites.
Park Profiles – This web page identifies air quality related values for Class I areas managed by NPS.

RACT/BACT/LAER Clearinghouse (RBLC) – This website provides access to information and decisions about pollution control measures required by air pollution emission permits.

EPA Guideline On Air Quality Models – This website explains the regulatory requirements for using air quality models and specifically the CALPUFF long-range transport model.
EPA’s Support Center for Regulatory Atmospheric Modeling (SCRAM) – This website contains documentation and guidance for air quality models, including downloadable computer code, input data, and model processors.
IWAQM Modeling Guidance (pdf, 3.2 MB) – This document explains long-range transport modeling for analyzing Class I Area impacts.
The CALPUFF model – This website explains the CALPUFF long-range transport model that should be used for Class I area impact analyses.
Class I Area Boundaries – This website provides maps of Class I area boundaries.
Class I Area Receptors – This website provides suggested receptor grids for Class I area impact modeling.
Emissions & Control Technology – Particulate Matter Speciation – This website provides specifications on particle speciation for a variety of sources. These specifications should be included in all modeling protocols.

Last updated: November 29, 2018