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

Changes the long title. 

Adds subject headings.

Amends proposed GS 143-215.107(i) making a clarifying change. 

Requires the Environmental Management Commission (Commission) to revise its permanent rules and in the meantime implement specified rules as prohibiting the Commission from adopting specified new federal standards except by a three-fifths vote of the Commission. These standards include New Source Performance Standards, Maximum Achievable Control Technology standards, and National Emissions Standards for Hazardous Air Pollutants. Provides that these provisions will expire on the date that the required substantively identical permanent rules are adopted. 

Prohibits the Commission from enforcing previously adopted federal New Source Performance Standards, Maximum Achievable Control Technology Standards, and National Emissions Standards for Hazardous Air Pollutants until the Commission readopts the standards using the above process.

Includes a severability clause.