No, pre-'73 cars don't have to comply to anything for emissions and after '73 it's 4.5% CO up until somewhere in the '80s and then they cut it down to 1.5% for a couple of years and now since quite a number of years it's 0.5% I think.
When my Camaro has it's bi-yearly inspection they only check if the brakes work (on the hoist and turn the wheels by hand), the handbrake, the position of the light beams, if all the lights work, ball joints, tread depth (minimal 1.6mm) and that's roughly about it. Car's pre-1960 don't get any inspection. Cars older than 30 and after 1960 get inspected every 2 years and younger than 30 every year. They assume that the really old cars get looked after anyway because they are generally owned by enthousiasts and don't get driven daily.
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Later,
~Alain~
Forced Induction:"You'll run outta tire, before you run outta horsepower"
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