The “Clean Air Conservation Act,” enacted in 1990, designates gaseous or granular materials that cause air pollution as “air pollutants” and requires them to be managed through monitoring and emission controls. There are 61 designated air pollutants, including carbon monoxide, ammonia, nitrates, and sulfates. Among these, substances that may be directly or indirectly harmful to human health or animal and plant growth and development in the event of long-term consumption or exposure, even at low concentrations, are designated and managed as “specified air pollutants.” There are 35 types of specified air pollutants, including dioxins, benzene, chromium, and cadmium.