Several tons of aluminum, barium, and strontium will be sprayed into the atmosphere tonight, the 4th of July, often in close vicinity to large crowds in people in large cities. Even small children will hold small devices that create clouds of nanoparticles of aluminum, barium, and strontium, and other heavy metals. I'm talking, of course, about fireworks. Those three elements are commonly referred to as being toxic elements that are sprayed in the "chemtrails" conspiracy theory. (source: http://skunkbear.tumblr.com/post/90696652324/boom-awww see also: http://chemistry.about.com/od/fireworkspyrotechnics/a/fireworkcolors.htm There is, of course, no real evidence that "chemtrails" are real. Yet the presence of aluminum, barium, and strontium in the environment (all three are naturally occurring, especially aluminum) is often pointed to as some evidence of spraying. Yet most people have no idea of how much of these elements should be found in the environment, or how much they are used in activities that they themselves have never though of as problematic. Even your kid's sparkler quite likely contains aluminum, and quite often barium or strontium. http://www.pyrocreations.com/sparkler_compositions The fumes that come off a sparker contain those metals. What's more they will be in the form of metallic nanoparticles: http://www.aaqr.org/Doi.php?id=29_AAQR-12-08-OA-0208 And there's quite a lot. America burns 30,000 tons of fireworks per year. 20,000 of that will be burned today, on the 4th of July.