Simplicity saves lives
Simple and comprehensible indicators will allow anyone to immediately assess the threat.
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Safe
Carbon monoxide was not detected or its concentration is extremely low, you can relax. -
Moderate
The CO concentration could affect how you are feeling, make sure you air the room, check ventilation and find the source. -
CO Alarm
CO levels are high enough to be a threat to life - follow the rules applicable for critical levels of CO concentration.