Laughing gas is greatest ozone layer threat

WASHINGTON

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That's the finding of scientists at the National Oceanic and Atmospheric Administration. They say nitrous oxide known as laughing gas is the biggest ozone depleting gas in the air.

It's a by-product of agricultural fertilizer and a number of industrial processes. The NOAA scientists are concerned because the gas is not covered by any global treaties to reduce emissions.

The study is published in science magazine.

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