The purpose of this legislation is to strengthen air quality regulations by closing loopholes that currently allow certain emissions from oil and gas operations to go unregulated. It aims to ensure that emissions from these sources are properly aggregated and accounted for under the Clean Air Act, thereby enhancing protections for public health and the environment. One of the key provisions of this legislation is the repeal of an existing exemption that allows oil and gas sources to aggregate their emissions without being subject to stricter regulatory oversight.