The Hidden Agendas of Masks, Distancing, and Tracing - Vaxxter

The maker of the N95 respirator mask designed it for the mining and construction industry. It filters out 95 percent of the visible airborne dust particles, keeping them from entering the lungs. It has vents so the wearers can exhale. Demolition crews use them, concrete laborers use them, so do workers who sand wood floors, gypsum board walls, and plaster ceilings. Workers in other trades, such as electrical, plumbing, rough carpentry, and wood finishers rarely wear masks.