> The point about airplanes not running the ventilation on full throttle till takeoff has always driven me crazy.

sucking in tarmac fumes would probably create more _immediate_ symptoms that could disrupt flights than waiting to ventilate after airborne, meaning your widely shared observation might reveal a business decision.

i.e., it might be just that tarmac fumes are really bad for everyone so they choose infectious coughed air over aromatic hydrocarbons from the tarmac.