If you are concerned about the air quality in your home, you might consider the services of a duct cleaning company. If your home uses forced air heating or cooling, the air in your home travels through ducts that, over time, can get a buildup of dirt or debris, and this can even give opportunity for microbes to grow inside of your ducts. This will impact the quality of the air you breathe.
There are many different companies that offer duct cleaning services, and it is important that you select a quality service. Not all companies offer to clean all components of the system, and if part of a contaminated system is not cleaned properly, there is a chance that it will get contaminated again.
Usually, specialized tools will be used to dislodge the dirt in the system, and then a high-powered vacuum will be used to clean the ducts out. They might also use chemicals made for killing microbes within your system.