The U.S. Environmental Protection Agency (EPA) and the Iowa DNR are required by law to reduce exposure to hazardous air pollutants (HAPs). EPA has issued over 120 National Emission Standards for Hazardous Air Pollutants (NESHAP). Approximately 50 of those NESHAP affect facilities in Iowa. DNR has developed implementation tools for the NESHAP in each section listed below.
Some NESHAP apply to both major and area sources of HAP, and some apply just to one or the other. Major sources are those with facility-wide potential or actual emissions of 10 tons per year or more of any single HAP or 25 tons per year or more of a combination of HAP. Area sources are those with potential and actual emissions below the major source thresholds.