House committee substitute makes the following changes to the 1st edition.

Adds a directive for the Department of Environmental Quality (DEQ) to prepare and submit to the US Environmental Protection Agency (EPA) for approval a proposed NC State Implementation Plan amendment based on the change to the motor vehicle emissions testing program provided by the act. Adds effective date provisions to the proposed changes to GS 143-215.107A (removing Onslow County from the motor vehicle emissions inspection program), providing that the changes are effective on the later of either (1) October 1, 2019, 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, whereby the DEQ Secretary must provide notice of the approval and the effective date of the act on its website and directly to certain affected parties, as specified.