It can be found both indoors and outdoors. The most common sources of formaldehyde are homes that contain smokers and fuel-burning appliances that are not venting properly. Particleboards, shelves, and cabinets are just a few items found in the household that may have formaldehyde. A form of formaldehyde foam insulation was most commonly used in homes up until the late 1980's when it was determined that this was a concern due to health problems so it was taken off the residential market. This type of insulation has a dark yellow color. If you have questions on whether your home contains this type of insulation, give us a call today and we can help.