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Colorado regulators target tiny oil field device that’s a big contributor to greenhouse gas, ozone pollution

Even major oil companies admit that tens of thousands of pneumatic controllers should be upgraded to prevent natural gas from seeping out

Colorado governor releases final plan to reduce emissions by 90%. It’s still too vague, environmentalists say.

The Air Quality Control Commission is responsible for reducing carbon dioxide emissions from millions of vehicles and industrial and office buildings

Oil and gas does about-face as six-week overhaul of Colorado drilling regulations begins

Operators for years groused about the danger of a “patchwork” of regulations. Now they’re focused on letting local governments have control.

Colorado, Denver join 25 other cities and states in suing EPA for relaxing clean-car rule

The EPA’s final rule also could impact Colorado’s zero-emissions mandate

Opinion: Yes, oil and gas emissions are major contributors to local ozone production

Opinion: Ozone is more serious for Colorado than greenhouse gas emissions

Opinion: Colorado’s climate future is now. Let’s confront the challenges and seize the opportunities.

Opinion: Want to solve the climate crisis? Stop widening roads

Colorado to challenge Trump administration decision ending states’ waiver for stricter vehicle-emissions

The Environmental Protection Agency on Wednesday is set to end a waiver that allowed California and other states to have tighter vehicle emissions rules than ones mandated federally

EPA set to end California’s ability to regulate fuel economy, which could impact Colorado

A dozen states -- including Colorado -- and the District of Columbia also follow California's fuel economy standards

Colorado commission votes 8-1 to adopt zero-emissions vehicle mandate after three-day hearing

Colorado's adoption of ZEV rule means more electric vehicles will be on sale in the state. Commissioner Tom Gonzales voting against the rule.

Auto dealers vow to keep fighting Colorado’s move to adopt less-polluting vehicle standards

The auto dealers sued to block the policy, but failed to convince a judge that lower-emission vehicles will cause “economic injury” to their industry

A voluntary effort to speed up the availability of electric vehicles in Colorado has come unplugged

Automakers hoped they could convince Colorado not to adopt controversial zero-emission vehicle standards by volunteering to make more electric-vehicle models available in the state

A first look at how Colorado will become a ZEV state: the rule, the cost, the debate

If Colorado becomes a Zero Emission Vehicle state, automakers must make 5% of their inventory electric vehicles by 2023. Automakers, however, offered an alternate EV plan

Kia Nero EV is not coming to Colorado soon.

Pollution is still drifting onto Rocky Mountain Park’s fragile ecosystems, report says

The report also said pollution will probably begin to decline because of tougher state and federal rules for vehicle emissions, planned retirements of coal-fired power plants and other steps

Colorado is a top electric vehicle state without a mandate. So why can’t locals buy most of the EVs for sale?

As Colorado considers adopting a zero-emissions vehicle mandate, some electric SUVs, crossovers and pickups are coming soon

Auto dealers sue state to prevent Colorado’s adoption of California’s low-emission vehicle standard

The state adopted the rule to help clean up the air quality and save on fuel, but it adds extra cost to new cars starting in 2022

More electric vehicles will likely be available in Colorado after a new executive order from Gov. Polis

The move puts Colorado on a path to be aligned with California’s zero-emission vehicles standards. The auto industry immediately pushed back

Colorado’s new attorney general plans legal action against Trump administration over health care, citizenship question

Phil Weiser says “there is going to be an ongoing opportunity for us to join a range of lawsuits that are protecting our Colorado way of life (and) our population and standing up for the rule of law.”

Opinion: Is automobile exhaust the new DDT in Colorado’s environment?

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