The Chemtrail conspiracy theory holds that the trails seen behind some aircraft are not ordinary contrails, but are the result of high-altitude spraying of some kind of chemicals or biological agents for a purpose undisclosed to the general public. Versions of the conspiracy theory circulating on the internet and on radio talk shows hold that these trails contain toxic substances deliberately sprayed from flying aircraft into the atmosphere, and that this activity is directed by government officials. The many versions of circulating rumors allege that various chemical or biological compositions and purposes are behind the aerial sprayings, but there is no evidence that these trails are anything but normal aircraft contrails consisting of water vapor and ice crystals. Federal agencies have received thousands of complaints from people who have demanded an explanation.Officials from four agencies in the United States jointly published a fact sheet to refute the rumors and to explain the science of contrail formation.
The term "chemtrail" does not refer to common forms of aerial spraying (e.g., crop dusting, cloud seeding or aerial firefighting). The term specifically refers to aerial trails allegedly caused by the systematic high-altitude release of chemical substances not found in ordinary contrails, resulting in the appearance of supposedly uncharacteristic sky tracks. Believers of this theory speculate that the purpose of the chemical release may be global dimming or population control, and claim that these trails are causing respiratory illnesses and other health problems.
Adjuvants are pharmacological or immunological agents that modify the effect of other agents (e.g., drugs, vaccines) while having few if any direct effects when given by themselves. Types of adjuvants include:
