Correct tire pressure for your car and most vehicles is between 35 psi and 45 psi.
However you can usually look on the sidewall of the tire on your vehicle and it will tell you the correct tire pressure for your vehicle and the tires on your vehicle.
If you have your owners manual for your car the recommended and correct tire pressure for your specific vehicle should be stated in the owners manual.
But as long as you're inflating the tires to at least 35 psi then you're usually at the correct tire pressure.