People spend the majority of their time inside their home. Dirty indoor air has potential to cause health problems. It can cause allergic reactions (fever-type symptoms), irritans and even cancer. To determine quality of air inside your home is very difficult task. In order to improve quality of air inside your home it is necessary to control moisture and mold, install fresh-air ventilation, improve and clean filtration, regularly clean and dust your house and finally get many house plants.