- The mechanisms that might contribute to ozone's ability to worsen existing asthma include:
A. Increased nonspecific airway reactivity
B. Increased respiratory inflammation
C. Increased responsiveness to inhaled allergen
D. A and C only
E. A, B, and C
Exposure to ozone has been shown to cause each of these health endpoints, and each health endpoint contributes to aggravation of existing asthma.