1. Zhang, Q. L. The Ministry of Environmental Protection reported on the air quality of some cities on January 30th. China Environmental News, January 30, 01 edition (2013).
2. Qiu, C. H. The special study of the Chinese Academy of Sciences restores the weather generation process of the Beijing-Tianjin-Hebei ash. China Youth Daily, February 16, 03 edition (2013).
3. Pope, C. et al. Lung cancer, cardiopulmonary mortality, and long-term exposure to fine particulate air pollution. Jama-J. Med. Assoc. 287, 1132–1141 (2002).
4. Kanakidou, M. et al. Organic aerosol and global climate modelling: a review. Atmos. Chem. Phys. Disc. 4, 1053–1123 (2004).
5. Samet, J. et al. Fine particulate air pollution and mortality in 20 US cities, 1987–1994. New Engl. J. Med. 343, 1742–1749 (2000).