Summer months can be tough on people with asthma, which affects more than 20 million Americans. Poor air quality caused by a combination of ground-level ozone and air pollution can worsen asthma symptoms, triggering wheezing, coughing, trouble breathing, and even leading to hospitalization in serious cases. Newspapers, websites, and TV news broadcasts often warn of so-called “ozone-advisory,” “ozone-alert,” or “ozone-action” days, when sensitive groups—those with asthma and other respiratory conditions—should stay indoors because potentially dangerous smog conditions are likely.

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