Pollution, as a Chinese character, is easy to make people think of sewage and pollution. Nowadays, the problem of air and water pollution has become a serious challenge for human beings, and the harm and economic impact of pollution are far beyond people's imagination. In addition to the gray sky and the lack of water resources, serious pollution is a great threat to the health of residents. The poster outlines the word "dirty" with flat surfaces and lines, sounding the alarm to people and reminding enterprises to take the initiative to assume social responsibility and protect people's health!