English: "Prediction of the actual transmission probability according to quarantine policies such as mandatory mask wearing and social distancing. This figure shows the variation in the number of exposed agents based on the implementation of social distancing and mandatory mask wearing with respect to different case scenarios. Mask wearing reduces the distance the virus can spread, and social distancing increases the average distance between individual agents in a metro carriage, as in Fig. 1. These two policies contribute to reduced exposure. In case 1, agents are most likely to exist around the infected agent and are more likely to be exposed because of the high probability of the exposed agent because social distancing is not maintained and no mask is worn. In case 2, social distancing is maintained, and thus the probability of exposed agent is low. However, the probability of exposed agents around the infected agent is high, thereby resulting in some degree of exposed agent. In case 3, social distancing is not performed. However, the infected agent is not exposed to many agents because of the mask and thereby resulting in a sharp drop in the number of exposed agents. As shown in case 4, implementing both policies results in a sharp decrease in the exposed agent."