Ozone and Your Patients' Health is a short, evidence-based training course and resource that: * Describes the physiological mechanisms responsible for the lung function changes and symptoms associated with exposure to ground-level ozone * Helps health care providers advise their patients about exposure to ozone * Provides practical tools to help patients understand what triggers their symptoms and how to alleviate them Ozone and Your Patients' Health is designed for family practice doctors, pediatricians, nurse practitioners, asthma educators, and other medical professionals who counsel patients about asthma and respiratory symptoms. Patients and their families may also use this material to learn the science behind ozone’s effect on respiration and how to manage their respiratory health using the Air Quality Index.