Particulate matter consists primarily of mold spores, insect parts, skin cells, pollen, dander, and even viruses. PM 2.5 can actually pass through the lungs and enter the blood stream. PM 2.5 & 10 can both contribute to allergys, asthma and other respiratory issues. A particulate count survey provides and quick and rudimentary way of evaluating the air quality. Essentially the purpose is to discover if there is an air quality issue so that further investigation can be conducted if needed.