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Chemicals Under Review for October 2017

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Two new chemicals were added to the “Chemicals Under Review” list this past month.

*_CAS No._*






No chemicals were added to the ITSL/IRSL database [ ] this past month.

The 1,3-butadiene (CAS # 106-99-0) ITSL changed from 2 g/m3 (24-hour averaging time) to 33g/m3 (annual averaging time).

The propylene carbonate (CAS # 108-32-7) ITSL was changed from 714 g/m3 (24-hour averaging time) to 700 g/m3 (annual averaging time). This chemical will be posted for formal public comment when there are several more chemical screening levels and justifications available to post as a group.

For diethylene glycol (CAS # 111-46-6), the ITSL changed from 21,000 g/m3 (24-hour averaging time) to 1,600 g/m3 1,600 (annual averaging time).

The propylene (CAS # 115-07-1) ITSL was changed from 1,500 g/m3 (annual averaging time) to 8,600 g/m3 (8-hour averaging time) based on a re-evaluation resulting in a change in the key study and critical effect.

The isobutene (CAS # 115-11-7) ITSL was changed from 21 g/m3 (annual averaging time) to 110,000 g/m3 (annual averaging time) due to an updated assessment and more recent toxicological studies.

For ethyl tertiary butyl ether (CAS # 637-92-3), the ITSL was changed from 373 g/m3 (annual averaging time) to 9,000 g/m3 (annual averaging time).

To view the Chemicals Under Review list for September 2017, please visit the DEQ Air Quality Web page [,4561,7-135-3310—,00.html ]. Click on the Permits tab, followed by the Air Toxics Screening Levels tab located on the bottom left side of the page. The Chemicals Under Review [ ] list is the last item in this category.

Along with the new formal public review, we will continue our past practice of inviting and addressing questions or concerns about any screening levels, at any time. If you have any questions, please contact Doreen Lehner <>, Air Quality Division, at 517-284-6753.

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