Regulation & law · 01/10/1999Updated: 10/17/2026 · 1 min read

EPA Publishes Revised Regulations for Radon Emissions from Phosphogypsum Stacks

The Environmental Protection Agency (EPA) has released a final rule revising the National Emission Standard for Hazardous Air Pollutants (NESHAP) to set limits on radon emissions from phosphogypsum stacks, and increasing the amount of phosphogypsum allowed in indoor laboratory research and development from 700 to 7,000 pounds per experiment.