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Old 08-15-2014, 12:15 AM   #42 (permalink)
theaveng
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Quote:
Originally Posted by jamesqf View Post
giving too high a weight to NOx emissions. That's probably a historic legacy, from back when urban smog was thought to be the only problem.
Not really historic..... the CARB-compliant states have banned any car that makes too much NOx. Like my 2006 Volkswagen diesel which (when I bought it) was only available in 45 states and banned in the other 5.

Even now for 2015 cars, NOx reduction is the reason several modern diesels carry urea (else they'd be banned in CARB states). It isn't history. It's the present limit. NOx creates poisonous air..... that's why it is strictly regulated as close to zero as possible.

I am amazed you didn't know that, but frankly I'm tired of NOx hovering over cities. You're not supposed to See air.
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