
This year let’s hope our Independence Day celebrations are more eco friendly than ever. Although the celebratory fireworks are meant to paint the sky with light, they however fill the sky with smoke, lead and mercury since they are always in the mix. Among the toxic culprits being addressed lately, potassium perchlorate is a reliable and inexpensive oxidizer, but it has been connected to cancers and thyroid problems. The technologies behind fireworks have changed little through the ages. Today’s fireworks products may be able to last longer and burn brighter, they essentially contain a form of gun powder used in wars fought in China some 800 years ago. Strontium and lithium may be used for red, barium and copper lead for green, and sodium glows golden. Calcium deepens colors. Zinc makes smoke clouds, aluminum sparkles, and antimony adds glitter. Scientists in Germany and at Los Alamos National Laboratory have explored reducing perchlorate, smoke, and carbon by using substances rich in nitrogen. Los Alamos researchers responded to complaints some 10 years ago from Anaheim, Calif., residents about pollution from fireworks shows every night at Disneyland. The theme park in 2004 announced it was adopting safer air cannons that use compressed air instead of a chemical propellant, eliminating black smoke.
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