Scientists say the ozone hole over Antarctica is no longer growing, the expectation is that it will take decades to recover.
Even with rainier days ahead, fire bans are still in place and strictly enforced.
What's burning, what shouldn't be burning, and what it all does to the air we're breathing right now.
- The American Lung Association placed Denver at eighth and Fort Collins at 10th in the country for poorest air quality regarding levels of ozone.Read more
A chemical used to replace ones that damaged the ozone turn into a greenhouse gas that persists for 50,000 years.
Colorado air regulators say they are working to reduce ozone concentrations, but say they have unique challenges.
The alert is in effect through 4 p.m. on Tuesday.