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The efficacy of Apple's charcoal filters is an open question.
Apple didn't change the filters for 5 years between 2015-2020, so they probably didn't work at all by 2020. (think about not changing the filter in your water pitcher for five years)
But even after replacing the filters Apple never tested them, & apparently simply guesstimated that the system should remove between 50-90% of chemical vapors, maybe.
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