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EPA/AR RIN: 2060-AK84 Publication ID: Spring 2010 
Title: Petition To Delist Hazardous Air Pollutant: 4,4'-Methylene Diphenyl Diisocyanate 
Abstract: The Clean Air Act requires EPA to regulate 187 compounds that are listed as air toxics, also known as hazardous air pollutants. Air toxics are those pollutants known, or suspected, to cause cancer and other adverse human health problems. The law requires EPA to consider petitions to modify the list, by adding or removing substances. Individuals seeking to remove a substance must demonstrate that there are adequate data to support their petition. The Agency received a petition to remove 4,4'-Methylene Diphenyl Diisocyanate (MDI) from the American Chemistry Council on December 26, 2002. Once EPA receives a petition, it conducts two reviews: a completeness review, to determine whether there is sufficient information on which to base a decision; and a technical review, to evaluate the merits of the petition. This petition was deemed complete in March 2006. There appears to be no question about the toxicity of MDI; rather the industry argues that there are little or no exposures due to the extremely low vapor pressure of MDI. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
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
Timetable:
Action Date FR Cite
Notice of Complete Petition  05/26/2005  70 FR 30407   
Proposed Response  To Be Determined    
Additional Information: SAN No. 4782; EPA publication information: Notice of Complete Petition - http://www.epa.gov/fedrgstr/EPA-AIR/2005/May/Day-26/a10579.htm; EPA Docket information: EPA-HQ-OAR-2005-0085.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Undetermined 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
KC Hustvedt
Environmental Protection Agency
Air and Radiation
E143-01,
Research Triangle Park, NC 27711
Phone:919 541-5395
Email: hustvedt.ken@epa.gov

Scott Jenkins
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code C445-01,
Research Triangle Park, NC 27711
Phone:919 541-1167
Email: jenkins.scott@epa.gov