This episode features an article titled "Proposed Revisions to Testing Regulations for Air Emissions Sources" by Stacy Arner. http://www.all4inc.com/air-emissions-testing-regulations-proposed-changes The proposed source testing rule can be found in its entirety on the Federal Register. https://www.gpo.gov/fdsys/pkg/FR-2018-01-26/pdf/2018-00470.pdf