From the perennial smog that makes Cairo give any city in China, India or Mexico a run for its money as the world’s most polluted, to the infamous seasonal "black cloud" that mercilessly impairs the health of the victims it hovers above annually, Egypt’s skies have long been beleaguered by one odious menace after another. The latest addition to these comes in the form of long trails of chemicals sprayed from the exhaust pipes of airplanes, now known as chemtrails.