Commerce City residents can borrow indoor-air and radon monitors

Commerce City residents can now borrow indoor-air and radon monitors from Anythink Commerce City Library, giving households a free way to get a snapshot of conditions inside their homes.

The city launched its Indoor Air Sensor Loan Program on July 27, 2026. The devices are available through the library at 7185 Monaco St., although the city says only a handful of each monitor is currently available. Residents should check availability before making a trip.

Two monitors answer different questions

The Temtop M10+ is designed to track common indoor-air indicators. It measures fine particulate matter, known as PM2.5, total volatile organic compounds, carbon dioxide and an overall air-quality rating.

The SAF Aranet Radon Detector focuses on radon. It records radon readings every 10 minutes, along with temperature, relative humidity and atmospheric pressure.

That distinction matters. The Temtop can help residents identify possible ventilation or indoor-pollution concerns, while the radon monitor can show whether a home may need more formal testing for a naturally occurring radioactive gas.

How to read the city’s indicators

Commerce City’s program guidance uses color-coded readings: green means good, yellow means moderate and red means poor. The guidance also recommends practical responses, such as improving ventilation or investigating possible indoor sources when readings are elevated.

Residents using the radon detector should keep it running for at least one hour for the best results from the loaned device. A yellow or otherwise elevated reading should not be treated as a diagnosis. It is a reason to arrange a certified or approved radon test.

Why radon readings need follow-up

Radon is invisible and odorless, so residents cannot identify it without testing. The Colorado Department of Public Health and Environment says about half of homes in Colorado have radon levels above the Environmental Protection Agency’s action level of 4 picocuries per liter.

The EPA action level is separate from the city’s green, yellow and red device indicators. A reading from the library monitor can provide useful information, but it does not replace a certified short-term or long-term test.

Colorado health officials provide information about approved testing methods, free test kits, certified testing professionals and mitigation. Some qualifying low-income homeowners may also be eligible for financial assistance with radon mitigation in a primary residence.

What residents should do next

Residents can use the library monitors to learn more about indoor conditions, then follow the city’s guidance before drawing conclusions from a single reading. Anyone concerned about radon should arrange a certified follow-up test through resources provided by the Colorado health department or Adams County Health.

Because the initial inventory is limited, availability may change. The city’s program guidance and the library are the best places to confirm whether a device is currently available and to review recommended next steps.

Sources

• Commerce City: Indoor Air Sensor Loan Program guidance
• Colorado Department of Public Health and Environment: Radon FAQ