“Airplanes are intentionally spraying chemicals into the atmosphere for the purpose of weather control or population manipulation.”

“Chemtrails” is a shortening of the term “chemical trails”. It is a term some people use to inaccurately claim that contrails resulting from routine air traffic are actually an intentional release of dangerous chemicals or biological agents at high altitudes for a variety of nefarious purposes, including population control, mind control, or attempts to geoengineer Earth or modify the weather. The federal government is not aware of there ever being a contrail intentionally formed over the United States for the purpose of geoengineering or weather modification.

Starting in Fiscal Year 2020, NOAA received direction from Congress to conduct research on natural events and human activity that could change the Earth's radiation budget (ERB), including solar geoengineering. Since 2020, NOAA's ERB Program has initiated various research activities on solar geoengineering, such as atmospheric modeling, stratospheric observations, and laboratory activities to understand the physical impacts of stratospheric aerosol injection (SAI) and marine cloud brightening (MCB).

The U.S. government is not engaged in any form of outdoor solar geoengineering testing or large-scale deployment. Solar geoengineering is not occurring via direct delivery by commercial aircraft and is not associated with aviation contrails. [1] While the U.S. federal government and various state governments have historically been involved in weather modification, mainly through cloud seeding activities, current science indicates that no existing technology can modify hurricanes. [1] Cloud seeding involves introducing artificial particles into clouds with the objective of increasing rain or snow or modifying regional and local weather patterns. [1]

The authors of this study, including Carnegie’s Ken Caldeira, conducted a survey of the world’s leading atmospheric scientists, who categorically rejected the existence of a secret spraying program. The survey results show that 76 of the 77 participating scientists said they had not encountered evidence of a secret spraying program, and agree that the alleged evidence cited by the individuals who believe that atmospheric spraying is occurring could be explained through other factors, such as typical airplane contrail formation and poor data sampling.

Weather modification is the deliberate intervention in the Earth's atmosphere to influence local weather conditions, typically through techniques like cloud seeding. Weather modification technologies that claim to achieve such large-scale or dramatic effects do not have a sound scientific basis and should be treated with suspicion.

There is misinformation on social media suggesting the condensation trails (contrails) from high-altitude aircraft are visual signs of attempts to alter the atmosphere or for other nefarious purposes. The term chemtrails is sometimes used to suggest that the condensation contains added chemicals. Despite numerous claims, there is no evidence to support such suggestions.

While contrails—short for condensation trails—are well-documented atmospheric phenomena created by aircraft engines at high altitudes, the concept of chemtrails suggests a more controversial narrative involving secretive government programs and chemical dispersal. ... Chemtrails, short for chemical trails, refer to a widely circulated conspiracy theory suggesting that some aircraft are deliberately spraying undisclosed chemicals into the atmosphere for purposes such as geoengineering, weather modification, or population control.

Ultimately, the 'chemtrail' phenomenon is a misunderstanding of a natural atmospheric process. The trails we see are simply contrails, a visible manifestation of water vapor freezing into ice crystals in the cold, upper atmosphere. ... At its heart, the idea of 'chemtrails' suggests that these vaporous streaks are actually chemicals being deliberately sprayed from aircraft for nefarious purposes – perhaps to control the weather or even to spread harmful substances.

Stratospheric aerosol injection (SAI) is a geoengineering technology wherein reflective particles are injected into the stratosphere to reduce the amount of sunlight hitting the Earth, cooling the planet and counteracting global warming driven by increasing GHG concentrations. Based on these significant problems and risks, we conclude that deploying stratospheric aerosol injection (SAI) is “Not Recommended.”

Chemtrails refer to the condensation trails, or contrails, left behind by airplanes as they fly through the atmosphere. Proponents of this theory argue that while normal contrails dissipate quickly, chemtrails persist and spread, potentially affecting weather patterns, human health, and even population control.

Stratospheric aerosol injection involves spraying small particles like sulfur dioxide into the upper atmosphere to reflect sunlight, and marine cloud brightening entails shooting sea salts into low-level clouds to cool a smaller area. [19] While small-scale cloud-seeding operations have been ongoing for over 80 years, solar geoengineering is still happening only on a very small scale, with start-ups like Make Sunsets beginning to proliferate. [19]

The overall scientific community agrees that there is no scientific evidence to support the claim that some contrails are really chemtrails. Contrails that linger for hours are cited as evidence of chemtrails, but the longevity of contrails varies based on humidity and temperature.

Most geoengineering proposals aim to block sunlight reaching the Earth's surface, for example by launching clouds of reflective particles into the atmosphere or using seawater sprays to make clouds brighter. ... A £10m programme of geoengineering research was announced by the UK's National Environment Research Council (Nerc) on 3 April to investigate the impact of solar geoengineering interventions.

Indeed, many of the state bills nod to conspiracy theories about a variety of technologies purportedly used in weather modification, referring ...

No peer-reviewed scientific studies support the existence of chemtrails for weather control or population manipulation; claims are consistently explained by contrail physics. Proponents often cite cloud seeding research, but this is distinct, localized, and publicly acknowledged, not secret global spraying.

Public consideration of the technology, however, is blighted by a surreal problem: the online popularity of baseless “chemtrail” conspiracy theories. Chemtrailers claim covert solar geoengineering programs are already underway and polluting the environment with toxic pollutants, as evidenced by aircraft contrails in the sky. The theory is completely false.