On October 19, 2023, for public comment and hearing, the Board proposed an amendment to keep Illinois’ definition of “volatile organic material” (VOM) “identical in substance” to the federal definition of “volatile organic compound” (VOC). The proposal reflects action taken by the United States Environmental Protection Agency (USEPA) on February 8, 2023. Specifically, USEPA excluded HFO–1336mzz(E) from its VOC definition (40 C.F.R. § 51.100(s)) after determining that the compound makes a negligible contribution to the formation of tropospheric ozone, commonly known as “smog.” The Board also made a few non-substantive changes to its VOM definition (35 Ill. Adm. Code 211.7150).
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