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The air transportation industry and environmental agencies face a difficult challenge over deicing. From late fall to early spring, the only way to make planes safe to fly is to spray them with chemicals to remove frost and ice. The problem is, those chemicals can suck the oxygen out of the rivers and streams they run into.

At Manchester Boston Regional Airport, deicing agents run into the Merrimack River. According to the latest test results, the chemical load can be more than thirty times what it ought to be.

New Hampshire Public Radio’s Jon Greenberg has more.