'96 and newer get the OBD II inspection. Vehicles that are 25 years or older do not have to be sniffed in the emission counties. Vehicles that are 35 years or older are not required to have an inspection.
So if your vehicle is between a '95-'82 and you live in an emission controlled county, your still required to meet the emission standards. But if your vehicle is '81-'72 your vehicle is only required to meet the standard safety inspection. '71 and older vehicles are not required to have a sticker, but they are supposed to meet the safety inspection standards.
Nine more months and I get to scrape the sticker off my rig!!!