Colorado's top air quality regulators have endorsed an innovative voluntary effort to reduce air pollution at Rocky Mountain National Park.

The Colorado Air Quality Control Commission added its support today at a hearing at state health department offices in Denver.

The program has already been approved by the U.S. Environmental Protection Agency, the National Park Service and the Colorado Department of Health and Environment.

The far-reaching effort, one of the first of its kind in the country, aims to reduce nitrogen levels that are hurting the park's pristine tundra and wildflowers.

"This is an important thumbs up, said Mike Silverstein, deputy director of the Colorado Air Pollution Control Division.