I'm from midwestern canada and i can smell it... it's not sweat. I think sweat makes the smell stronger though - maybe dampness allows the odor molecules to better bond/stick to you? whenever i go outside with wet hair even momentarily my hair picks up the smell of "outside", and replaces the fresh shampoo scent

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I've been walking a lot in winter, and when I come home I smell like ozone and "outside". I've tried reapplying deodorant but to no avail. maybe it's our body chemistry, maybe our olfactory neurons.