Colorado’s Regional Haze plan complied with EPA’s long-standing policy on how states can incorporate voluntary source closures. Yet EPA nonetheless disapproved the plan as part of a coordinated effort ...

Environmental groups plan to sue the EPA for missing a deadline to designate areas violating the 2024 soot standard, ...

For more than a decade, Colorado has consistently failed to meet federal standards for ground-level ozone across the Front Range where 3.3 million people live.

The harmful carbon pollution from gas-guzzlers can increase the risk of asthma, exacerbate incurable conditions like chronic obstructive pulmonary disease, and contribute to premature death, according ...

Environmental and public health groups sued the Environmental Protection Agency over its reversal of a landmark climate finding that greenhouse gas emissions pose a threat to public health.

A group of environmental organizations filed suit against the Environmental Protection Agency Wednesday for cutting rules to lower tailpipe pollution.

California will challenge EPA’s “endangerment finding” repeal in court. The U.S. Conference of Mayors pledges to "fight for ...

Lawsuit from health and environmental justice groups challenges the EPA’s rollback of the ‘endangerment finding’ ...

The legal challenge filed in the D.C. Circuit challenges President Donald Trump's rescission of the 2009 endangerment finding ...

The EPA repealed the key underpinning of greenhouse gas emission regulations. Now environmental and health advocates are ...

A coalition of health and environmental groups is suing the Environmental Protection Agency, challenging the rescinding of a ...

Last week, the EPA rolled back a key climate finding that gave the federal agency the authority to regulate greenhouse gas ...