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FR Air Documents
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
- In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emission Measurement Accuracy Margins for Portable Emission Measurement Systems and Program Revisions | PDF Version (78K, About PDF)
- In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emission Measurement Accuracy Margins for Portable Emission Measurement Systems and Program Revisions | PDF Version (111K, About PDF)
- Partial Removal of Direct Final Rule Revising the California State Implementation Plan, Monterey Bay Unified Air Pollution Control District and San Joaquin Valley Air Pollution Control District | PDF Version (55K, About PDF)