Achieving healthy air quality is a growing global concern, and Robert Percival discusses the critical junctures in U.S. environmental history that have led to the emergence of global environmental regulation, particularly in relation to China. According to a 2013 World Health Organization report, more than one million people die every year in China from exposure to air pollution. By referencing historical U.S. tragedies and air quality achievements, particularly the Clean Air Act, Percival uses his conversations with Chinese officials to point toward a turning point in China's legislation and attitude towards this environmental issue.