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Understanding the Smog Index on new vehicles - READ ONLY

6 messages,  Last post on Nov 06, 2007 at 10:44 AM

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Messages Page 2 of 2

#4 of 6 From your other post at gh.com by larsb

Nov 06, 2007 (8:14 am)

This is what Ken G said over at GH.com when you axed this que4stion there:
 
The Smog Index sticker only appears on California cars and a few other states that have recently adopted it. A quick google search will reveal that this index is strictly a measure of hydrocarbons, with no other pollutants factored in. The index is not a direct measurement. It is a rating of a cars position relative to a standard for it's class. That's why the Altima scores better than a Sentra with the same engines. The Altima is compared to other cars in it's size class that generally have larger engines.
 
Adding to that fact is that the V6 Altima and the 4-cyl Sentra SER score the same at fueleconomy.gov in the Air Pollution score. Nissan made that V6 Altima pretty darn clean for it's class.

#5 of 6 But all cars have the same rating. by nozferat

Nov 06, 2007 (9:58 am)

The index is not a direct measurement. It is a rating of a cars position relative to a standard for it's class.
 
Somehow that doesn't make sense because the rating for ALL cars is 0.38 for the 2007 year. Not just in that class. That number is on all cars for some reason.
 
It's still wierd if you ask me.

#6 of 6 maybe THIS will explain it by larsb

Nov 06, 2007 (10:44 am)

I think this will finally "clear the air" in regard to the Smog Index (Dang, I crack myseff up !!!)
 
Read this PDF
 
and this doc:
 
Click Me

Messages Page 2 of 2

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