Hmm, advertisers openly on this thread (seemed likely)....OK, fine, no problem but if a TB bacillus (2-4 microns) can't get by a decent grade N95 mask (e.g., 3M 1860 - yup there are lots of cheaper, non-certified knockoffs out there claiming N95) neither can the much larger pollen (smallest in 10 micron range, largest around 100)...period. Whatever, one can "shake out" a good N95 and re-use it once but long term re-useable, no and it costs a buck or 2 per mask. Whatever, if not major league allergic consider cetirizine or fexofenadine on your "mowing day", and for moderate dust try washing your nose out with generic (cheap) salt water sprays. Heck, I have access to hospital N95 masks, probably as many as I want, but only have minor pollen issues and dust is more a problem getting in my eyes (even with sunglasses) while I'm mowing than in my nose. Just wash the darn stuff out after you mow.
I'm sure the Wolfsnout is fine - just consider trying the aforementioned alternatives before laying out cash.
Take care out there - yeah, if it's dry there's going to be major dust with mowing, and if also pollen season, that too.