Emissions from a power plant in Kentucky. The sweeping regulation will aim at smog from power plants and factories across the country.
Credit Luke Sharrett for The New York Time

For 44 years, the U.S. Environmental Protection Agency (EPA) has defended the American people’s right to breathe clean air by setting national air quality standards for common air pollutants.

Successful public health protection depends on the latest science. Think of it this way: If your doctor wasn’t using the latest medical science, you’d be worried you weren’t getting the best care.

That’s why the Clean Air Act requires EPA to update air quality standards every five years, to ensure standards “protect public health with an adequate margin of safety” based on the latest scientific evidence.

So today, following science and the law, I am proposing to update national ozone pollution standards to clean up our air, improve access […]