Article B is: Chen Y et al. (2013). Evidence on the impact of sustained exposure to air pollution on life expectancy from China's Huai River policy. Proceedings of the National Academy of Sciences. 110(32): 12936-41.
What do you think the public health significance of the research question in this study was? Is it mostly of local significance or is there a global impact? Explain.
Does the study fill an important gap, in your opinion? Why or why not? Critique the methodology.
Why do you think the authors chose this methodology and what would you have done differently? Explain. Interpret the results in your own words and then discuss with your colleagues whether you agree or disagree with the author's interpretations and why.