On January 4, 2024, the Board adopted amendments to keep Illinois’ definition of “volatile organic material” (VOM) “identical in substance” to the federal definition of “volatile organic compound” (VOC). The amendments reflect one action taken by the United States Environmental Protection Agency (USEPA) during the first half of 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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