Ruckelshaus, Administrator, Environmental Protection Agency v. Natural Resources Defense Council, Inc., et al.

Opinion summary

Etalia.ai summary of the majority opinion

The case addressed the interpretation of the Clean Air Act, specifically whether the Environmental Protection Agency (EPA) could allow states to adopt a plantwide definition of 'stationary source' for purposes of meeting air quality standards. The Natural Resources Defense Council (NRDC) challenged an EPA regulation that permitted states to treat all pollution-emitting devices within a single industrial grouping as one 'bubble,' allowing them more flexibility in managing emissions without requiring individual permits for each device. The Supreme Court upheld the EPA's decision, ruling that its interpretation was reasonable and consistent with congressional intent under Chevron U.S.A., Inc. v. Natural Resources Defense Council, Inc., establishing what is known today as Chevron deference—a principle where courts defer to agency interpretations when statutes are ambiguous and agencies provide reasonable explanations.