This post provides an important update to our January 2018 Client Alert regarding U.S. EPA’s ‘Once In, Always In’ policy for major sources of hazardous air pollutants (HAPs). On October 1, 2020, U.S. EPA issued a final rule amending the general provisions of the National Emission Standards for Hazardous Air Pollutants (NESHAP), at 40 CFR… Continue Reading