The best replacement for carbon monoxide is carbon dioxide.

The best alternatives to carbon monoxide are rated as following:

★★★★★	carbon dioxide
★★	dioxide
★★	oxygen
★★	smoke detector
★	cyanide
	co2
	smoke alarm
	air density
	carboxyhemoglobin
	hydrogen cyanide
	smoke detectors

Your alternative for carbon monoxide is not listed? Suggest!

Speaking about carbon monoxide, one probably shouldn't forget about smoke detector.

Other search terms related to carbon monoxide and their ratings are:

★★★★★	smoke detector
★★★	hemoglobin
★★	haemoglobin

You have in mind a companion for carbon monoxide and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of carbon monoxide in all years. Click on graph for more.

carbon monoxide

carbon dioxide

dioxide