Clarifies when a physical change in a stationary source constitutes a modification or construction under the Clean Air Act.

The bill amends sections 111, 169, and 171 of the Clean Air Act to clarify when a physical change in, or change in the method of operation of, a stationary source constitutes a modification or construction. It specifies that a modification includes a change that may be costly, may significantly alter the site, is permanent in nature, or is to accommodate an installation to an emissions unit. The bill also clarifies that a change at a major emitting facility does not constitute a modification if it does not result in a significant emissions increase.

Clarifies when a physical change in a stationary source constitutes a modification or construction under the Clean Air Act.

The bill amends sections 111, 169, and 171 of the Clean Air Act to clarify when a physical change in, or change in the method of operation of, a stationary source constitutes a modification or construction. It specifies that a modification includes a change that may be costly, may significantly alter the site, is permanent in nature, or is to accommodate an installation to an emissions unit. The bill also clarifies that a change at a major emitting facility does not constitute a modification if it does not result in a significant emissions increase.