I'm quite happy staying indoors, so no need for a mask! That is a bit... large, and I'm somewhat reminded of the one I had in the army: fun and games going for a long "double march" (i.e. jog) on a randomly hot October day in a respirator and "noddy suit", i.e. a nuclear-biological-chemical protection suit you wear over your regular camo (i.e. heavy) gear. That was unpleasant.
Apart from the risk of frightening small children, you'd need to check it would filter out the relevant particles or vapour: not all masks filter all things. And if it's an older one (which it doesn't seem to be) or of unknown provenance that it doesn't use asbestos as a filter medium: very good at filtering stuff but not so good for other reasons.
