Ninety employers across the Denver region joined this year's Go-Tober Challenge, encouraging workers to choose cleaner ways to commute throughout October. A total of 1,297 participants logged 25,731 trips by walking, biking, taking transit, carpooling, vanpooling and teleworking, preventing more than 101 tons of carbon dioxide emissions from entering the atmosphere.

Top performers in each employer size category included:

• Regional Air Quality Council (extra small).
• Consor Engineers (small).
• City of Lone Tree (medium).
• CordenPharma (large).
• Colorado Department of Public Health and Environment (extra large).

Eleven local governments participated in the challenge. The City of Lone Tree earned top honors among member governments and won its size category. Boulder County placed second, followed by the Town of Castle Rock in third. The City of Boulder, Jefferson County, City of Englewood, City of Arvada and City of Littleton also had strong performances.

Together, employees from participating member governments eliminated 5 tons of carbon dioxide emissions by replacing more than 1,200 solo driving trips with sustainable transportation options.