KOKOMO, Ind. (AP): The Indiana Department of Environmental Management has begun testing around Kokomo Opalescent Glass to determine if the art-glass manufacturer is emitting hazardous amounts of potentially toxic materials.

The Kokomo Tribune reports that the Environmental Protection Agency started investigating in February after a glass factory in Oregon was found to be releasing dangerous amounts of toxic metals.

That investigation led the EPA to investigate glass manufacturers across the nation. The agency determined the Kokomo factory was violating the Clean Air Act by failing to obtain a federal permit that regulates glass manufacturers.

IDEM plans to set up air monitoring equipment to further test for elevated pollution levels.

Barry Sneed, a public information officer with IDEM, said samples will be taken at various times over the next year.