If you live in an area known to have poor air quality or have family members who suffer from allergies, asthma or other respiratory diseases, a whole home air purifier is definitely worth the investment. Hostile air contaminants can cause symptoms ranging from headaches and sinus irritation to chronic bronchitis and even cancer. Using an air purification system to eliminate these contaminants aids in symptom reduction; as a result, allergy and/or asthma episodes are less frequent and less severe.