文摘
Weather system is a relative complex dynamic system, the factors of the system are mutually influenced P M 2.5 concentration. In this paper, a new method is proposed to quantify the influence on P M 2.5 by other factors in the weather system and identify the most important factors for P M 2.5 with limited resources. The relation map (RM) is used to figure out the direct relation matrix of 14 factors in P M 2.5. The decision making trial and evaluation laboratory(DEMATEL) is applied to calculate the causal relationship and extent to a mutual influence of 14 factors in P M 2.5. According to the ranking results of our proposed method, the most important key factors is sulfur dioxide (SO 2) and nitrogen oxides (NO X ). In addition, the other factors, the ambient maximum temperature (T max), concentration of P M 10, and wind direction (W d i r ), are important factors for P M 2.5. The proposed method can also be applied to other environment management systems to identify key factors.