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Description
Approximately 6,500 entries summarize air permitting actions for major pollution sources under the NSR program. The data covers Facility, Process, and Pollutant levels, including details like Permit Date, NAICS code, Pollutant Name, and Emission Limits. It is maintained by the U.S. EPA with voluntary contributions from U.S., Mexican, and Canadian agencies.
Use Cases
Analyze emission limits and control method descriptions by pollutant name and CAS# to benchmark industry standards.
Map facility locations and permitting dates by state and NAICS code to study regulatory trends over time.
Identify processes with specific throughput values and associated pollutant data to model sector-specific emissions.
Compare case-by-case basis requirements and other applicable requirements across different process type codes.
Strengths
Contains approximately 6,500 permit entries with detailed Facility, Process, and Pollutant level information.
Provides temporal coverage from 1980 onwards, including some historical permits from the 1970s.
Includes international records from Mexico and Canada, with all data provided in English for consistency.
Limitations
Coverage is not complete or necessarily representative as participation by agencies is voluntary, except for LAER determinations.
Data is not overwritten, which may lead to multiple historical references but could complicate analysis of current status.
The dataset's last known update was in June 2021, which may not reflect recent permitting actions.
Provenance
Source
U.S. Environmental Protection Agency (EPA), with contributions from state, local, Mexican, and Canadian air pollution control agencies.
Collection Method
Entries are generally provided by the original permitting agency, with some data entered by EPA Regional Offices on behalf of agencies.
Time Range
Coverage began in 1980, with some historical permits from the 1970s included.
Freshness
Last updated in June 2021; update frequency is not specified.
Geography
Covers all U.S. states and territories, U.S. waters, and includes international records from Mexico and Canada.
Data is provided under an 'other-license-specified'; users must review specific terms. Inclusion is voluntary for most records, so the dataset is not a complete census of all permits.