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Comment on NYC's new rat-killing weapon is wildly successful – for nowparent

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Dry ice sublimates into CO2 which also suffocates the rats as CO2 is heavier than air and will fill up a burrow, taking away all the oxygen.

Sure, although the article talks about monoxide…thus my confusion. It’s also a much less pleasant way to go: this is an “as I understand it” to be clear; carbon monoxide binds to your hemoglobin better than oxygen, but your bloodstream doesn’t build up carbon dioxide (which is what causes that panicky “I need a breath” feeling). Adding CO2 accelerates that feeling…

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