The U.S. Environmental Protection Agency listed parts of Clermont, Morgan, Washington and Jefferson counties and all of Lake County after air quality monitors in each of those areas registered higher than normal concentrations.
Fifteen teachers from five states - including Ohio - are spending the week on Lake Ontario as part of a research program. The teachers are aboard the Lake Guardian, a research vessel operated by the U.S. Environmental Protection Agency.
The U.S. EPA is investigating the cause of a January chemical emergency at an Auglaize County well facility and asking why an inventory of the facility's chemicals wasn't available to local safety authorities.
The U.S. EPA has issued new requirements for cleansing ballast water dumped from ships, which scientists believe has brought invasive species that damage ecosystems and cost the economy billions of dollars.
Columbus-based American Electric Power will stop burning coal at two power plants in Ohio and Indiana by the end of 2015 under a legal settlement reached with the U.S. EPA, eight states and several environmental groups.