But the ride was sponsored by Chevron from 1998-2012, and that company is pretty dedicated to poisoning small children anyway, so it was apt.
Thankfully, in 2012, Disney attracted a new sponsor, Honda, and in 2016, Honda upgraded the engines to small four-stroke engines, reducing noise and pollution significantly. However, the cars still create exhaust, which is still poisonous to the children riding behind these polluting engines. It’s also poisonous to employees, to the point where Disney pays hazard pay to employees who are assigned to staff the ride.