Whistleblower warns London Underground passengers of toxic dust exposure

A whistleblower has raised concerns about toxic dust on the London Underground. The warning targets daily passengers who use the network. The claim suggests exposure to hazardous particles in stations and trains. Authorities have been urged to investigate the source of the dust. Health officials may assess potential risks to commuter health. The whistleblower’s identity remains undisclosed. The Guardian reported the story on July 18, 2026. Further steps could include testing and remediation of affected areas.