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EPA/AR | RIN: 2060-AM20 | Publication ID: Spring 2010 |
Title: Petition To Delist a Hazardous Air Pollutant From Section 112 of the Clean Air Act: Methyl Isobutyl Ketone (MIBK) | |
Abstract: The Ketones Panel of the American Chemistry Council (ACC) has petitioned the Agency to remove methyl isobutyl ketone (MIBK) from the Clean Air Act (CAA) hazardous air pollutant (HAP) list. The ACC originally submitted the petition in April of 1997. EPA suspended review of the petition pending the completion of 2-generation reproductive effects study. That study is now complete. On October 17, 2003, the ACC submitted an addendum to the 1997 petition which includes: the results of the 2-generation reproductive effects study, a presentation of the updated EPA IRIS file for MIBK, updated air dispersion modeling, and an analysis of potential transformation products. Based on this new submission, the ACC requested that EPA reopen its review of the MIBK petition. EPA did reopen its review of the petition. However, since the last submittal by the petitioner, a 2-year MIBK bio-assay by the National Toxicology Program (NTP) has been completed. A draft report of this study was reviewed by the NTP Board of Scientific Counselors Technical Reports Review Subcommittee, which accepted unanimously the conclusions in the report that there is some evidence of carcinogenic activity of MIBK. EPA has notified the petitioner that further review of the petition will require that the petitioner submit information regarding the relevance of the NTP study and a risk characterization for the human risk of cancer from MIBK exposures, which would include the derivation of a cancer unit risk estimate. | |
Agency: Environmental Protection Agency(EPA) | Priority: Substantive, Nonsignificant |
RIN Status: Previously published in the Unified Agenda | Agenda Stage of Rulemaking: Long-Term Actions |
Major: No | Unfunded Mandates: No |
CFR Citation: 40 CFR 63 | |
Legal Authority: 42 USC 7412 |
Legal Deadline:
None |
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Timetable:
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Additional Information: SAN No. 4849; EPA publication information: Notice - http://a257.g.akamaitech.net/7/257/2422/06jun20041800/edocket.access.gpo.gov/2004/04-16335.htm. | |
Regulatory Flexibility Analysis Required: No | Government Levels Affected: None |
Small Entities Affected: No | Federalism: No |
Included in the Regulatory Plan: No | |
RIN Data Printed in the FR: No | |
Agency Contact: Ken Hustvedt Environmental Protection Agency Air and Radiation E143-01, RTP, NC 27711 Phone:919 541-5395 Fax:919 685-3200 Email: Hustvedt.Ken@epamail.epa.gov |