On 2020-11-18, Rich D <
rdelan...@gmail.com> wrote:
> A nearby college includes a building, surrounded by an
> outdoor arcade, at street level. At one point, the warm
> internal air is expelled, which is natural, they perform
> continuous circulation. A nice spot, on a cold night!
> However, I wonder, is there any hazard in breathing that air?
> Is it chemically processed somehow, contaminated?