A severe haze appeared unexpectedly in early 2013，when it lasted for days，covered one fourth of China’s land area and affected nearly half of its population.While worrying about environmental damages and worsening pollution，people are shifting the focus of attention toward how haze affects their health.Several research reports on the effects of haze on human health published by Chinese and foreign scholars most recently present shocking data and conclusions，which underscore the urgent need for dealing with haze pollution and have made relevant policymakers become a major focus of media coverage.