Environmentalists threaten to sue EPA over Denver ozone SIP

The Center for Biological Diversity (CBD) and Center for Environmental Health are threatening to sue EPA over its failure to ensure several required elements of Colorado’s plan to fight harmful ozone are in place, as environmentalists continue their pressure to drive down ozone in the Denver metropolitan region. In an April 2 letter to Administrator Andrew Wheeler, CBD on behalf of both groups gives 60 days’ notice of its intent to sue the agency over its failure to approve or...