Now that I always have masks I wear them all the time for other things: outside and inside dust, smoke. Most recently I went to an antique engine show. Most of the engines were running. Mask (and ear plugs) made that a lot more pleasant. Weirdest was a strong wind, acted as a shield.

Oh yeah, even walking through the city, especially with all the construction going around, it just feels SAFER with a mask. Definitely helps my asthma.