For millions of children with allergies and asthma, heading back-to-school with high levels of fall pollens and molds in the air and exposure to potential allergens and viruses in class can really take a toll. In fact, asthma, which can be triggered by allergies and respiratory illnesses, causes a 46 percent increase in emergency room visits among children during the season, and is the number one reason why students chronically miss school... 
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