We must not underestimate the need for clean air. As a physician, I see how the climate and air quality affects my patients with lung disease, every day. Children and adults living in areas with poor air quality suffer even more with asthma and respiratory tract infections. We also know that air quality affects lung development in growing children. To protect everyone, including future generations, we must not underestimate the need for clean air. We must strive for policies that limit toxic pollution from industries and vehicles.