Daily Rules, Proposed Rules, and Notices of the Federal Government
This notice of data availability (NODA) makes available to the public a human health effects review of R-744 (CO
In 2006, EPA proposed to amend the acceptability of R-744 to include the use condition that MVAC systems must be designed to avoid occupant exposure to concentrations above the CO
In addition, during the public comment period, one commenter suggested that the proposed use conditions should be clarified to address whether the same standard applies or whether a requirement even applies when the motor vehicle ignition is off.
EPA is making available, for review and comment, a contractor-authored memo on the toxicological impacts of short-term exposure to CO
All of the information can be obtained through the Air Docket and at
1. Whether EPA should include a ceiling limit of 4% R-744, or 40,000 ppm, in the final rule on the use of R-744 in new MVAC systems, in addition to the short-term exposure limit of 3% averaged over 15 minutes, and
2. Whether the proposed use conditions on R-744 in new MVAC systems should apply when the ignition is off.
Commenters may provide any published studies or supporting statements. At this time, EPA is not requesting comments of a general or editorial nature. EPA is not accepting comments more generally on the proposed listing of R-744 as acceptable with use conditions. Interested readers are directed to 71 FR 55140 for additional information regarding EPA's proposed listing of R-744 as acceptable with use conditions in the MVAC sector.
1. Explain your views as clearly as possible.
2. Describe any assumptions that you used.
3. Provide any technical information or data you used that support your views.
4. Provide specific examples to illustrate your concerns.
5. Make sure to submit your comments by the comment period deadline identified.
6. To ensure proper receipt by EPA, identify the appropriate docket identification number in the subject line on the first page of your response. It would also be helpful if you provided the name, date, and Federal Register citation related to your comments.
Environmental protection, Administrative practice and procedure, Air pollution control, Reporting and recordkeeping requirements.