STAR SMOG CHECK BLOG
"WHAT CALIFORNIANS ARE SAYING ABOUT "STAR CERTIFIED SMOG CHECK"
Is the California Smog Check Program is inherently unfair?
1) Consider this, the California Smog Check Program gives an unfair advantage to the vehicles operated in, and by, northern residents of the state. One reason for this unfair advantage is that the results of a smog check performed on a dynamometer are influenced by weather conditions. When
the ambient temperature is low, and humidity is high, a marginal vehicle will pass the inspection whereas the very same "marginal vehicle" would likely fail the very same inspection in the southern areas of California.
A "marginal vehicle" is defined as a vehicle which, if tested several times, under the identical conditions would "pass" or "fail" roughly 50% of the time. The tailpipe emission readings are affected positively by the amount of H2O in the ambient air. The relative humidity slows down the "burn time" of the fuel-air mixture which reduces emissions.
Furthermore, when vehicles are subject to a dynamometer based emissions test on a rainy day, the vehicle tires are required by procedural regulation to be dried. The drive wheels are placed on the dynamometer, and a large fan is positioned in front of them.
The fan will be turned on while the tires are rotating at speed for as many as 90 seconds. This procedure gives ample time for the catalytic converter to "light off." Most catalytic converters tend to "light off" or become active above 600*F.
The tire drying procedure grants the vehicle testing in northern California an unfair advantage to diminish exhaust emissions that would not be afforded to the same vehicle being tested in Southern California on a dry, warm day.
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