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Many states require emissions tests on vehicles. This means that you
drive to a facility where the test people take a sample of your
emissions and run it through some analysis. The results are printed,
and you pass or fail depending on the percentage of toxic emissions
that turn up in your car's sample.
The only way to "study" or prepare for this test is to take good care
of your car, including its emission system. If you use preventative
maintenance, and keep your car tuned properly, you will pass. If you
tamper with your emissions system, you will not pass. You can have
your car checked independently before your emissions test if you want
to resolve problems before going to the emissions test station.
One other good thing to do is to save your printouts from the test
from year to year. If you compare them, you will be able to monitor
your car (if its score is getting worse) and catch any problems
before the emissions people catch you.
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