DEA technique is widely used for efficiency evaluation of Decision Making Unit (DMU) with multiple inputs and outputs. This paper applies DEA model to the study of the efficiency of environmental pollution treatment in 8 provinces including Hebei and neighboring or Maritime Provinces. The results show that the efficiency of Efficiency of Environmental Pollution Control in Hebei Province is not high. Environmental pollution improvement in Hebei Province still needs to be expanded.

facing the problem of VOCs pollution, VOCs concentrations in urban Tianjin have been measured to identify their possible sources. Using positive matrix factorization, seven VOC sources are identified in urban Tianjin according to the factor loadings of various VOCs, including: 1) motor vehicle exhaust; 2) gasoline evaporation; 3) internal engine combustion emission; 4) diesel emission; 5) solvent usage; 6) industrial emission; and 7) biogenic emission. The identified sources of VOCs are significantly related to vehicular activities, which specifically contribute 60% to VOCs loadings in urban Tianjin, respectively. Controlling vehicle emissions should be top priority for VOCs reduction in Tianjin.