# PM2.5 De Minimis Emission Levels for General Conformity Applicability
> **Rule** · Direct final rule; amendments. · Published 2006-04-05 · Effective 2006-06-05 · 71 FR 17003
## Document
- **Document number:** 06-3311
- **Category:** air-emissions
- **Federal Register citation:** 71 FR 17003
- **CFR reference:** 40 CFR 51
- **Publication date:** 2006-04-05
- **Effective date:** 2006-06-05
- **EPA docket:** EPA-HQ-OAR-2004-0491
## Abstract

The EPA is taking direct final action to amend its regulations relating to the Clean Air Act (CAA) requirement that Federal actions conform to the appropriate State, Tribal or Federal implementation plan for attaining clean air ("general conformity") to add de minimis emissions levels for particulate matter with an aerodynamic diameter equal or less than 2.5 microns (PM<INF>2.5</INF>) National Ambient Air Quality Standards (NAAQS) and its precursors.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/04/05/06-3311/pm25-de-minimis-emission-levels-for-general-conformity-applicability)
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