Persistent and non persistent chemtrails

Chemtrails: the truth about criminal aerosol operations in the skies all over the world.
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Contrails only form at very high altitudes (usually ~26,000 to 30,000 feet) where the air is extremely cold (less than -42 degrees C) and the relative humidity is near to 72 percent.

Pay attention to non persistent and brief chemtrails that can appear as contrails. At low altitude we cannot see contrails, so, if you see a non persistent trail, this is a chemtrail like persistent chemtrails.