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80,000 children a day miss school, many just after school starts when conditions are worst

A growing number of patients learn of allergies to new hips & knees only after surgery is done

Rise in temperatures & carbon dioxide levels are boosting pollen, extending allergy seasons

Experts urge later start times at other schools after charting homeschool sleep benefits

Energy-efficient homes trap air pollution indoors, may contribute to rise in asthma rates

By exposing children to the foods they’re allergic to, doctors may gradually boost tolerance