buick215: here in Britsh Columbia, the emissions test involves running the vehicle onto a double set of rollers so that the test can be done in the testing station. There are fans providing air to the front and of course sniffers up the tailpipe(s). The test takes 240 seconds during which the vehicle is accelerated hard up to highway speeds, run at cruising speeds, rapid deceleration etc.
If the vehicle is 1998 or younger, a quicker test is possible if the ECU's records show cleanliness. We pay $45 for the yearly test. If you believe the government statements/propaganda, the emissions testing has made a significant 30+% difference.
Perhaps the engine/cats were not fully warmed up as I drove only about 10-15 minutes to the testing station - as Adam in NYC points out, this may have influenced the NOx readings. Also, I turned the engine off while waiting 10 minutes in line...that was a mistake.
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