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Colorado air quality regulators update plan to lower ozone levels and align with EPA standards

The new State Implementation Plan comes as the Front Range anticipates a downgrade in its ozone compliance status

Opinion: For our children’s future, we must vote for our climate

Oil and gas companies must monitor fracking emissions as Colorado adopts first-in-the-nation rules to reduce air pollution

Some environmental groups say the new regulations, which also give local governments access to collected data, aren’t fully baked even after long negotiations

Colorado oil and gas emissions rules begin to tighten, but gaps open over what is monitored, by whom and where

Western Slope commissioners say rules designed to pull the Front Range into federal ozone compliance are an “economic risk” for northwest Colorado

Opinion: It’s time to talk about Colorado’s unwanted houseguest – air pollution

Opinion: Colorado needs statewide rules to reduce oil and gas emissions

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

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

Mountain athletes push progress over perfection in climate fight

Protect Our Winters’ embrace of “imperfect advocacy” is designed to motivate large-scale action on climate change. “We can’t afford to have anyone be silent right now," said athlete Caroline Gleich.

Opinion: Stronger methane rules will benefit the West Slope and Front Range alike

Opinion: Why the zero emission vehicle standard matters — and what it means for Colorado

A tiny garden in Boulder is showing signs of stress from smog. The scientist behind it is thrilled.

Four types of plants growing near the entrance to NCAR are part of a nationwide network of gardens where citizen scientists and climate researchers collect data about the impact of ground-level ozone