I don't know… If I'm sitting at home or at a cafe working, I want my headphones to block all bicycle bells and ambulances on the street. Those in traffic could perhaps just turn their ANC off?

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loco5niner 4 hours ago | parent [-]

... and fire alarms? carbon monoxide detectors?

	▲	grvbck 3 hours ago \| parent [-]
		Won't those cut right through the ANC just by volume alone? A domestic fire alarm is 85–120 dB, I don't think my airpods can mute that. And of course there will always be fringe cases. What if I go to sleep with regular foam earplugs, what if I take a sleeping pill etc. Or what if the warning sound can't be engineered to fit a ANC friendly frequency, like somebody screaming, a car tire screech behind me and so on.