Because of a 'grandfather clause', the strict emission standards only apply to new cars.
(..) - Andrew! - I heard you were here. It's so nice to see you. Vincent, it's so nice. What is this about the Borgias? Those days are over. - Recognise it? - Yeah. Genco Olive Oil. That's where our grandfather started as a delivery boy. Three years later he owned it. - Only in America. - That's it. (..)1990 The Godfather Part III