National Air Toxics Assessment and Cancer Risk in Allegheny County Pennsylvania Updated – May 2021

In August 2018, the U.S. Environmental Protection Agency (EPA) released the results of its 2014 National Air Toxics Assessment (NATA). More recent data are not yet available. The purpose of NATA is to identify and prioritize air toxics (a subset of chemicals in the air pollution mixture, also called Hazardous Air Pollutants (HAPs)), emission source type, and locations that are of greatest potential concern in terms of contributing to population risk. Based on 2014 emissions data, this assessment characterizes potential public health risk due to inhalation of air toxics including both cancer and non-cancer effects. The U.S. EPA considers cancer risks over its 1 in 1 million benchmark to be of concern.