# Nonconformance Penalties for On-Highway Heavy Heavy-Duty Diesel Engines
> **Rule** · Interim final rule. · Published 2012-01-31 · Effective 2012-01-31 · 77 FR 4678
## Document
- **Document number:** 2012-1937
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 4678
- **CFR reference:** 40 CFR 86
- **Publication date:** 2012-01-31
- **Effective date:** 2012-01-31
- **EPA docket:** AMS-FRL-9623-8
## Abstract

EPA is taking final action to make nonconformance penalties (NCPs) available to manufacturers of heavy heavy-duty diesel engines in model years 2012 and 2013 for emissions of oxides of nitrogen (NO<INF>X</INF>). In general, the availability of NCPs allows a manufacturer of heavy-duty engines (HDEs) whose engines fail to conform to specified applicable emission standards, but do not exceed a designated upper limit, to be issued a certificate of conformity upon payment of a monetary penalty to the United States Government. The upper limit associated with these NCPs is 0.50 grams of NO<INF>X</INF> per horsepower-hour.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/01/31/2012-1937/nonconformance-penalties-for-on-highway-heavy-heavy-duty-diesel-engines)
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