TLDR
Nearly all surveyed specialists found no evidence that airplanes are secretly spraying chemicals on a large scale. They said the trails and test results presented as proof had other explanations, including ordinary flight conditions and flawed sample collection.
Summary
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1 Study Aim
The authors aimed to assess claims of a secret large-scale atmospheric spraying program (SLAP), often called “chemtrails.” They asked whether specialists had encountered evidence of such a program and how they interpreted photographs of aircraft trails and chemical test results. The researchers wanted to find out whether specialists saw proof of secret spraying.
2 Study Design
The authors surveyed two expert groups: atmospheric scientists specializing in condensation trails (visible trails formed behind aircraft) and geochemists (scientists who study Earth’s chemical composition). They identified experts through highly cited research papers and invited 171 trail specialists and 190 atmospheric-deposition specialists, who study material settling from air onto Earth. Forty-nine trail specialists and 28 deposition specialists completed separate surveys. The surveys asked about possible evidence, showed photographs or sample analyses, and assessed sample-collection advice. The researchers asked specialists to review the trails, test results, and collection methods.
3 Findings
The study reports that 76 of 77 respondents had never encountered evidence of a secret large-scale atmospheric spraying program (SLAP). All 49 trail specialists said ordinary trail formation best explained the four photographs, citing factors such as moisture and aircraft altitude. Most deposition specialists also rejected the chemical test results as proof; some said more information was needed, and others found the readings typical of dust or sediment. Most disagreed with online sampling advice, warning that it could contaminate samples. The authors conclude that the evidence reviewed does not support secret spraying and recommend careful attention to real pollution concerns. Specialists found no convincing proof of secret spraying, and poor testing methods could mislead people.