Stage 1 fire restrictions, enacted for unincorporated areas of western Boulder County.

aspen trees and clear sky

Air Quality

Boulder County works to improve indoor and outdoor air quality through education, monitoring, and policy.

Marshall Fire & Air Quality

Boulder County Air Quality Monitoring by Boulder A.I.R. at Boulder Reservoir

Since 2017, Boulder County has funded an air quality monitoring study at the Boulder Reservoir. Monitoring tracks the presence of compounds such as nitrogen oxides, methane, ethane, propane, pentanes, and benzene and provides near real-time measurements of their concentrations. Go to Boulder A.I.R’s website to see this data. See Current Studies for more information.

ditch burning on a farm

Burn Permits

Burn permits are required for open burning of slash in Boulder County. Permits may be denied if a practical alternative method of disposal exists. Learn more about requirements for spring, summer, fall, and winter, as well as alternatives to open burning.

Portrait of loving family on carpet


Radon is an invisible, odorless, cancer-causing gas that enters buildings through the cracks and pipes of a house’s foundation. Learn how to test your home for radon and what to do if the test comes back positive.



Mold (or mildew) is the common name for fungi in the indoor environment, although molds are found everywhere in both the indoor and outdoor environment. Learn more about the health effects, prevention, and how to fix the problem.