Aerosol: definition Aerosol is a suspension of solid or liquid particles in a gas Atmospheric aerosols consist of small particles of liquid and solid material suspended in the air Bioaerosol: An aerosol of biological origin. (Examples viruses, bacteria, fungi, spores, and pollens. Aerosol sizes are usually measured in the unit of micrometer (um) um =10- m 1 um=104 angstrom(A)Aerosol: Definition • Aerosol is a suspension of solid or liquid particles in a gas. • Atmospheric aerosols consist of small particles of liquid and solid material suspended in the air. • Bioaerosol: An aerosol of biological origin. (Examples: viruses, bacteria, fungi, spores, and pollens.) • Aerosol sizes are usually measured in the unit of micrometer (mm) – 1 mm = 10–6 m – 1 mm = 104 angstrom (Å)