Citation:
Zhang RY, Guo S, Zamora ML, Hu M. Reply to Cao and Zhang: Tightening nonfossil emissions alone is inefficient for PM2.5 mitigation in China. Proceedings of the National Academy of Sciences of the United States of AmericaProceedings of the National Academy of Sciences of the United States of AmericaProceedings of the National Academy of Sciences of the United States of America. 2015;112:E1403-E1403.