All outside air gets into the car all the time, e.g. pollution, and there is no way to stop it.
This car is great has everything you may need of a car, power, economic, good looking.
The outside air is supposed to come in all the time. This is true for any vehicle as it prevents CO poisoning from the exhaust. The only way to stop the outside air from coming in is to set the A/C on MAX (the first A/C setting).