Most people look up into the sky every day and never notice condensation trails and chemical trails that are in our atmosphere almost on a daily basis. Contrails or vapor trails are condensation trails made by the exhaust of aircraft engines or wingtip vortices which precipitate a stream of tiny ice crystals in moist, frigid upper air. Being composed of water, the visible white streams are not, in and of themselves, air pollution. However, contrails generated by engine exhaust are inevitably linked with typical fuel combustion pollutants. Contrails might also be considered visual pollution.
Chemtrails are a chemical and/or biological agent of some sort that is being released. The term “chemtrail” does not refer to common forms of aerial dumping (e.g. crop dusting,cloud seeding or aerial firefighting). It specifically refers to systematic, high-altitude dumping of unknown substances for undisclosed purposes, resulting in the appearance of these unusual contrails. Where contrails usually trail the airplane around two thumb widths behind the aircraft and then would dissipate, chemtrails are seen throughout the entire sky. They for the most part grow into high-level Cirrus clouds and can lead to forming Cumulus or Stratus clouds.