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I think it does. People raised on farms have less allergies than the rest of the general population [citation needed but I'm lazy]

Kids need to play outside, in the dirt, interact with live animals and other kids and be exposed to a lot of different food when they're young and later on in life as well.

There's many studies that support that hypothesis though it tends to be in the 0-5 age range.

Not only allergies but I also wonder about air quality in general.