`A hydrofluoric acid spill has forced the closure of a significant portion of the downtown Phoenix area this morning. [..]
About 330 gallons of hydrofluoric acid leaked from a truck that was heading north on Seventh Avenue from Interstate 17, officials said. The truck turned east on Monroe and stopped at about Fifth Avenue.
Hydrofluoric acid is highly corrosive, but does not produce any toxic or harmful fumes, officials said.’
The “officials” are “officially idiots”. The minimum lethal dose for humans is 50 ppm in air over 30 minutes. By my calculations, 330 gallons would be enough to kill 982,586 people, if ingested.