From the USA Today:

After 12 years and four lawsuits, the Environmental Protection Agency on Monday for the first time set rules governing how much mercury and other pollutants existing cement plants can release.

The agency says the rules will cut mercury emissions by these plants by 92%, particulate matter by 92% and sulfur dioxide by 78%, saving $7 to $19 in public health benefits for every dollar in costs.

Cement plants are the United States’ third-largest airborne source of mercury, after coal-fired power plants and industrial and commercial boilers, the EPA says. Read more.