For many Americans spring means uncomfortable outdoor allergies. Coughing. Sneezing. Wheezing. According to the Asthma and Allergy Foundation of America, asthma and allergies strike 1 out of every 4 Americans and are the leading chronic diseases in the U.S. among all age groups. And it’s not just outdoor air that’s the culprit. The EPA (Environmental Protection Agency) reports indoor air levels of many pollutants may be 2-5 times, and occasionally, more than 100 times higher than outdoor levels. Indoor air pollutants are particularly concerning because statistics show most people spend as much as 70% of their time indoors.