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Re:Scientist says cleaning indoor air could make us healthie... by legulere on Friday August 06, 2021 @01:32AM (#28083645)
Air pollution is probably one factor in the development of allergies:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3192198/

Playing in mud and with animals is probably beneficial, but unclean air isn’t.

Re:Scientist says cleaning indoor air could make us healthie... by vagrantJin on Friday August 06, 2021 @01:47AM (#28083737)
Unclean air is as vague a term as any.
Re:Scientist says cleaning indoor air could make us healthie... by p_j_w on Friday August 06, 2021 @10:37AM (#28087743)
The link he references does a pretty good job establishing what he meant by the phrase "unclean air."