Have you ever seen a gray sky when you go out? Almost every person may have seen a gray sky full of fine dust. Since fine dust influences people's health directly, the government has to take some actions against it. It can become an immediate cause of death. If so, which solution should the government come up with? To make the solution more effective, removing the main cause of the problem seems to be the priority. Providing free public transportation to people is the best way to resolve the fine dust problem, as it reduces the fundamental cause of the occurrence of fine dust.