I'm not trying to be a wise guy. I live in NYS, in the NYC/Metro-suburban area and we have strict smog regs like CA. We even do this roller loop test at 15 & 25 mph.
Anyway, two inspections ago the place called me up to give me the heads up that my car wouldn't pass the NOx test. We don't have "state run smog inspection stations". We have auto repair shops do the testing. I went over and found that I had left the power key in the "Full Power" position.
Just a shot in the dark!