Homes often contain air pollutants in the form of fine dust, micro-organisms, bacteria/viruses, moulds, hair, allergens, and pollen. Similarly, the straw, hay or wood shavings that are often used as bedding material. If symptoms such as shortness of breath, coughing and deterioration of existing lung diseases increase, there is a high chance that the air quality in the home is getting worse. People with lung diseases, asthma and COPD can benefit from the improvement of the air quality in their home.