Anti-geoengineering campaigners are pushing claims that government and military aircraft are spraying toxic particles on the public — a charge officials reject as a misreading of ordinary jet contrails.

• The claim: grid and X patterns in the sky come from aerosol spraying, not jet exhaust, with military tankers carrying the biggest loads.
• Supporting evidence offered includes transponders switched off and spray patterns in areas with no commercial flight routes.
• Campaigners point to graphene oxide, aluminum, and polymer nanoparticles, arguing the mix is far more toxic combined than separately.
• The alleged damage is sweeping: insect and wildlife collapse, dead soil in California, and particles turning up in human organs.
• The current administration, like previous ones, denies any spraying program and calls the patterns normal aircraft exhaust.

Outlook: Expect the dispute to stay a fringe-versus-official standoff, with no change in government position and continued pressure from activist groups.