[Should I get a half face respirator or might as well get a full face?]

Now im just using it for diy stuff like mowing,woodworking,painting, and pesticides maybe.

I cant seem to figure out why you wouldnt wear a full mask everytime, if things can hurt your insides cant they hurt your eyes too when u just wear some safety glasses? By the way i have pretty bad allergies too. My first post!! ty 4 reading