1. Rubin ES, Hao Y. Engineering and Environment Introduction. Beijing: Science Press, 2004.
2. China Statistical Yearbook 1978–2007. National Bureau of Statistics of China. Beijing: Statistics Press, http://csp.stats.gov.cn.
3. Wang CH. Status of nitride oxide pollution and its treatment technology development and standards. Machniery Industry Standardization & Quality, 2008(3):20–22.
4. Bergan T, Gallardo L, Rodhe H. Atmosphere Environment, 1999(33): 1575–1585.
5. Tang SB, Wang HC. Chemistry of Environmental Organic Pollution. Beijing: Metallurgical Industry Press, 1996.