What Is the List of Hazardous Air Pollutants?
The list of HAP includes a wide variety of organic and inorganic substances released from large and small industrial operations, fossil fuel combustion, gasoline and dieselpowered vehicles, and many other sources. The HAP have been associated with a wide variety of adverse health effects, including cancer, neurological effects, reproductive effects, and developmental effects. The health effects associated with the various HAP may differ depending upon the toxicity of the individual HAP and the particular circumstances of exposure, such as the amount of chemical present, the length of time a person is exposed, and the stage in life of the person when the exposure occurs. The list of HAP, which includes MDI, can be found in section 112(b)(1) of the CAA. The HAP list provides the basis for research, regulation, and other related EPA activities under the CAA. B. What Is a Delisting Petition? A delisting petition is a formal request to EPA from an individual or group to remove a specific HA
