In the preceding companion paper (Part I), a method with one sensor that could identify the indoor contaminant source location and strength in short time was presented. On the basis of further theoretical study, a method with two sensors is presented in this paper to identify contaminant source with higher accuracy. This paper demonstrates how to use the method with two sensors to find the location of contaminant source in a threedimensional room. In addition, the accuracy of two types of methods was compared. The correctness probability, which are used to evaluate the accuracy of source locating, of the method with two sensors and the method with one sensor are 83.3% and 94.8% respectively. The results show that the method with two sensors works better for locating contaminant source than that with one sensor. In practice, the method with two sensors may be more applicable for the situations where the accuracy of source identification is crucial while the costs of sensors are not of great concern.