young man wearing an n95 respirator dust mask up close

202003296564 air airborne antiviral background blue change clean climate close closeup collar contagious coronavirus covid19 danger dangerous dark day dust emissions epidemic equipment face filter filtration flu global health horizontal ill image industrial industry isolated kilmer male man mask matter media n95 pandemic particulate person photo pollution precaution prevention profession protection protective respirator safety security set shown sick sickness virus warming wearing white work young