Fireworks cause environmental pollution

U.S. government scientists say Fourth of July fireworks displays often held over lakes and other bodies of water can pollute the water with perchlorate.

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<p><a href="http://www.physorg.com/news99672229.html">Fireworks cause environmental pollution</a></p> <p>U.S. government scientists say Fourth of July fireworks displays often held over lakes and other bodies of water can pollute the water with perchlorate. </p>