Energy & environment · 18/04/1994Updated: 10/15/2026 · 1 min read
Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; State of North Carolina
The US Environmental Protection Agency (EPA) has approved North Carolina's maintenance plan and redesignation of the Raleigh/Durham area from nonattainment to attainment for ozone, effective January 15, 1993.