The 8 Best Carbon Monoxide Alarms of 2021

By The Spruce

Kidde Nighthawk Plug-In AC/DC Carbon Monoxide Alarm Detector

"Best Overall"

FIRST ALERT Battery Operated Combination Smoke and Carbon Monoxide Alarm

"Runner-Up Best Overall"

Google Nest Protect 2nd Generation

"Best High-End"

Kidde Carbon Monoxide Detector Alarm

"Best Budget"

FIRST ALERT Carbon Monoxide Detector

"Best for Long Battery Life"

FIRST ALERT Alexa Enabled Smoke Detector and Carbon Monoxide Detector Alarm

"Best Smart Home"

FORENSICS Car, Vehicle, Aircraft Carbon Monoxide CO Detector

"Best Portable"

Kidde Code One Battery Operated Carbon Monoxide Detector

"Best Multi-Pack"