The expansion of Denver's Interstate 70 in northeast Denver is the subject of a lawsuit from the Sierra Club which has now gained traction with other groups joining. The The suit, filed in the U.S. Court of Appeals for the District of Columbia Circuit, challenges new EPA Clean Air Act requirements.

While the Colorado Department of of Transportation (CDOT) claims that under new EPA requirements increased emissions from traffic on the expanded I-70 would not violate national air quality standard, the project would gain no federal funding under the earlier version of the act. Plaintiffs in the case, such as the Elyria and Swansea Neighborhood Association, are staunchly against expansion for these environmental reasons:

Critics claim the reconstruction will be an environmental disaster. Drew Dutcher, president of the Elyria and Swansea Neighborhood Association, said those living adjacent to I-70 have already suffered health problems.

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