Which factor most reliably triggers acute asthma episodes in urban youth?

Which factor most reliably triggers acute asthma episodes in urban youth?

• A. Short naps during the day
• B. Drinking water with electrolytes
• C. Outdoor exercise in clean air
• D. Ozone exposure from traffic and industry

Answer: (D)

Ozone exposure from traffic and industrial emissions is a well-established trigger for acute asthma episodes, especially in urban youth. Ozone is a powerful respiratory irritant that forms when sunlight drives chemical reactions between pollutants from cars and factories. When inhaled, ozone irritates the airway lining, causing inflammation and increased airway hyperresponsiveness, which can lead to sudden asthma symptoms like coughing, wheezing, and shortness of breath. Urban environments often have higher ozone levels, particularly on sunny, warm days, making these episodes more likely for young people with asthma. The other options don’t influence the airways in the same reliable way: short naps don’t affect asthma triggers, drinking water with electrolytes doesn’t provoke asthma symptoms, and outdoor exercise in clean air is generally not a trigger and can even be beneficial, though exertion can cause symptoms in some individuals under certain conditions.

Ozone exposure from traffic and industrial emissions is a well-established trigger for acute asthma episodes, especially in urban youth. Ozone is a powerful respiratory irritant that forms when sunlight drives chemical reactions between pollutants from cars and factories. When inhaled, ozone irritates the airway lining, causing inflammation and increased airway hyperresponsiveness, which can lead to sudden asthma symptoms like coughing, wheezing, and shortness of breath. Urban environments often have higher ozone levels, particularly on sunny, warm days, making these episodes more likely for young people with asthma. The other options don’t influence the airways in the same reliable way: short naps don’t affect asthma triggers, drinking water with electrolytes doesn’t provoke asthma symptoms, and outdoor exercise in clean air is generally not a trigger and can even be beneficial, though exertion can cause symptoms in some individuals under certain conditions.