EPA seeks public comment on its plan for periodic retrospective review of regulations as called for by Executive Order No. 13563, Improving Regulation and Regulatory Review.

EPA proposed a supplemental federal implementation plan for the Four Corners power plant on the Navajo Nation in New Mexico to reduce visibility-impairing pollution.

EPA proposed to restrict the states' use of emission reduction credits from outside a nonattainment area to meet the 1997 eight-hour ozone NAAQS.