A global survey of 77 leading atmospheric scientists found 76 had no evidence of any secret spraying programs.

Scientists who know about condensation trails and air pollution were asked if they had ever seen proof of secret chemical spraying from planes. Almost all said no. They explained that the trails people call 'chemtrails' can be explained by normal plane contrails and usual weather patterns. This study shows there's no scientific support for the idea of a hidden spraying program.