This volume covers data describing the role of free radicals and antioxidants in respiratory disorders, including the data that deal with clinical and pre-clinical trials. Chapters describe the relationship of oxidative stress to a number of respiratory and pulmonary conditions from a basic science and clinical perspective, including chronic obstructive pulmonary disease, asthma, acute lung injury, pulmonary hypertension, toxicity and fibrosis, cancer and asbestosis. The book also discusses the use of conventional biomarkers of oxidative stress and breath condensates as adjuncts to classical laboratory testing, the effect of antioxidants on cellular protection, as well as the development of novel antioxidant modalities.