EPA will propose amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) from Portland Cement Manufacturing (Portland Cement NESHAP) to clarify the intent of the provisions promulgated in the 2018 Portland Cement NESHAP Risk and Technology Review final rule published on July 25, 2018 (80 FR 54728) applying to previously idled cement kilns. If a cement kiln was idle during the required testing period, the “idle kiln provision” of the 2018 final rule allows facilities 180 days to demonstrate compliance with the rule once that kiln is brought back online. On September 21, 2018, Sierra Club and two community groups submitted a petition for reconsideration of the 2018 final rule. The petition identified three issues, one of which pertained to the idle kiln provision. On July 18, 2019, EPA granted reconsideration of the idle kiln provision.