"By most measures the American environment is getting better, not worse. Clearing the Air explains improving air quality in terms that are informative, engaging, and optimistic. Read it and breathe deeply."
—Gregg Easterbrook, The New Republic
"A timely and thought-provoking contribution...I found Goklany's data to be not only eye-opening but also utterly plausible and convincing."
—A. Denny Ellerman, Center for Energy and Environmental Policy Research, MIT