If your CO2 levels rise too high or fall too low, the test results may be an indication that you have a health condition that needs diagnosis and treatment. Your body produces CO2 gas as a byproduct.

When enabled, your Alexa smart speakers will listen for smoke and CO2 alarms ... How we test the best smart smoke detectors To determine which smart smoke detector is best, we first install ...

If CO goes above 30ppm, the LED will flash green to alert you to potentially dangerous conditions brewing, but the alarm will not sound until CO hits 70ppm. I didn’t test the CO detection ...

How We Test Smoke and Carbon Monoxide Detectors Each smoke and carbon monoxide detector that enters Consumer Reports’ labs is rigorously tested to make sure it will keep you and your family safe.

We test carbon monoxide detectors to British Standard BS EN 50291-1 and the alarms we select to be Best Buys need to detect carbon monoxide in every one of the 20+ gas detection tests we carry out, ...