As reported in the last issue of the Air Quality Letter, the Division for Air Quality filed amendments to 401 KAR 60:005 and 401 KAR 63:002 to update the existing regulations through July 1, 2016 by incorporating changes to 40 CFR Parts 60 and 63 since the last state regulatory amendments. Also included were amendments to 401 KAR 63:060, which sets out the list of hazardous air pollutants and the hazardous air pollutant source categories. The amendments became effective March 4, 2017.