Science

Updated 4:39 p.m.

The U.S. Environmental Protection Agency has announced the first-ever national standards for air pollution from power plants.

The rule will require Ameren and other electricity companies to reduce emissions of toxic pollutants like mercury and arsenic, which can cause developmental effects, cancer, asthma, and other serious health problems.

Updated 4:13 p.m.

An independent panel says the US Army Corps of Engineers did what it could to prevent this year's record flooding along the Missouri River but that changes will be needed to manage increasingly frequent extreme weather events.

Hydrologist Bill Lawrence of the National Weather Service participated in the panel review and says Montana's record-breaking rainfall in May contributed to unprecedented runoff downstream.