Senate committee substitute makes the following changes to the 3rd edition.

Further amends GS 143-215.107A by also excluding Lee and Rockingham counties from the motor vehicle emissions inspections requirements. Extends the deadline by which the Department of Environmental Quality (DEQ) must submit a proposed NC State Implementation Plan amendment to no later than December 31, 2020 (was, no later than December 31, 2019. Extends the effective date provisions to the proposed changes to GS 143-215.107A, providing that the changes are effective on the later of either (1) January 1, 2021 (was, January 1, 2020), or (2) the first day of the month that is 60 days after the DEQ Secretary certifies that the US EPA has approved an amendment to the NC State Implementation Plan submitted pursuant to the act.

Changes the act's titles.

Changes the bill classification from a local bill to a public one.