The airborne particles reflect solar radiation.

Freezing temperatures solidify airborne vapor particles.

Aluminum particles can stay airborne for several days when released into air

Making employees work without any protection from airborne particles while the workplace undergoes extensive renovation would be an OSHA violation only if the concentration of the airborne particles was greater than the OSHA Permissible Exposure Limit (PEL). While there are a few rough rules of thumb for assessing particle concentration, the only sure way of determining whether the OSHA PEL is being exceeded is to measure the amount of particles in the air.

An airborne pathogen is a disease or sickness that can be transmitted through the air. This includes various viruses, fungi, and bacteria. These may be spread by coughing, sneezing, or dusting.