...I actually still do have the DEQ test results from 2 years ago.
They have changed the format, in that the reported readings are from a test on a rear wheel roller, with the car in drive, vs. the idle/2,500 rpm readings from the current test.
The results are in grams/mile, with the THC (Total HydroCarbons?) allowable at 1.20 and the reading for the 420SEL at 0.04, NOx at 3.00, with the car at 0.73, CO at 30.0 with the car at 1.6 and a final test for CO2 with no standard stated but a reading of 833.9 for my car. In both cases the engine was definitely "on"... As to where they stuck the probe, I defer to their professional expertise...
I don't know how these test results, expressed as they are in grams/mile, compare with the recent ppm readings. I do note that the cost of plates & registration for two years went up by $24 to a total of $75, which includes the $21 DEQ testing.
Cheers!