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Old 09-19-2007, 11:30 PM   #11
BailOut
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Drives: 2007 Yaris Liftback
Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
Quote:
Originally Posted by alhope34 View Post
Kept failing on what the place called "nox". Limit was 200 and something and my car was doing in the 2500's
"Nox" is short for "noxious emissions". Gasoline-burning vehicles produce 3 kinds of emissions:

1) GHG (greenhouse gases - Carbon Dioxide and Nitrous Oxide)

2) Nox (noxious emissions - Nitrogen Oxide, Carbon Monoxide, Sulfur Dioxide, various carcinogenic (cancer-causing) hydrocarbons... all the stuff that acid rain is made of)

3) Passive (paint flakes and fumes, leaking fluids, etc.)


A catalytic converter helps mostly with the "nox" group.
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