[dust mag. 98x picture here]	Particulates - Term used for the mixture of solid particles and liquid droplets found in the air. Over 99% of particulate matter is invisible to the naked eye and can easily infiltrate the lungs. On average, every cubic foot of untreated indoor air contains 20 million particles.
[green and red microbe picture here]	Microbes - Includes three major types of organisms: bacteria, protozoa, and fungi/mold. Most of these contaminants rely on a humid and moist environment for growth & survival. Some molds can produce certain chemicals, such as mycotoxins and Volatile Organic Compounds (VOC's).
[funny looking gases and odours picture here]	Gases & Odors - Indoor gases, such as benzene, formaldehyde, and hydrogen sulfide, are released from furniture, carpets, hair sprays, cleaning chemicals, insulation, and pesticides. Gases include VOC's which evaporate into the air easily. Odors are often made up of VOC's or other gases.

Category	Pollutants	Sources
Particulate	Dust	Humans, drapes, outdoor air
Particulate	Pollen	Clothing, outdoor air, pets
Particulate	Tobacco Smoke, Hydrocarbons	Smokers
Particulate	Dander	Humans, pets
Microbial	Mold Spores	HVAC ducts, carpets, outdoor air
Microbial	Bacteria	Waste containers, toilets, humans, A/C coils & ducts
Microbial	Fungi	Pets, foods, outdoor air, waste containers
Gas	Methyl mercaptan	Plastic, natural gas and propane additive
Gas	Carbon disulfide	Solvents
Gas	Butyl acetate	Lacquer, industrial chemicals
Gas	Methyl mthacrylate	Solvents
Gas	MEK	Solvents
Gas	d-limonene	Solvents
Gas	Toluene	Solvents
Gas	Hydrogen sulfide	Toilet vents, water