Mercury and Air Toxics Standard Rollback Explained

By Sustainability Awakening

Updated February 23, 2026

Mercury Rules Rolled Back The Mercury and Air Toxics Standard rollback weakens limits on toxic pollution from US coal plants.

What Is the Mercury Rule? The Mercury and Air Toxics Standard limits mercury, arsenic, lead, and other toxic metals from power plants.

Why Mercury Matters Mercury is a neurotoxin. It damages brain development in babies and increases heart risks in adults.

The 2012 Impact After implementation, mercury emissions from coal plants dropped about 90 percent nationwide.

What Changed in 2026? The EPA weakened updated limits that would have reduced mercury emissions by another 70 percent.

Why Roll It Back? Officials say easing air toxics regulation helps aging coal plants meet rising electricity demand.

Coal’s Share Today Coal generates less than 20 percent of US electricity but remains a major source of mercury emissions.

Health Costs Could Rise Stronger standards were projected to save $420 million in health costs through 2037.

Who Is Most Affected? Children, pregnant women, and communities near coal plants face the highest exposure risk.

Is Grid Reliability at Risk? Evidence shows previous mercury rules reduced pollution without destabilizing electricity supply.

What Happens Next? The Mercury and Air Toxics Standard rollback shifts costs from utilities to public health. Energy choices now matter more than ever.