[Someone1234]

They're racing against other cars, cars to the right, cars to the left, cars in front. I don't see what the aerodynamic profile is meant to inform us?

[Karunamon]

If I were to hazard a guess: the fact that air is directed over and around the driver's compartment would mean that at racing speeds, someone around or in front of your car releasing an aerosol would mean you're unlikely to be exposed to it