GPM not PPM... - Saab General Bulletin Board - Saabnet.com
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Most emmission limits are written in terms of grams per mile, not PPM concentration. So if the SUV uses 4 times more air, its "sort of" 4 times more difficult to make it clean... Of course, over the last 10 or 15 years the gm/mi limits have gotten way tighter.
Check out http://www.epa.gov but they put a lot of consumer fluff in there. You have to dig a bit to get the actual regulations.
Like Chris says, its easier to clean up NOx & CO, but CO2 is tougher because it IS the product of complete combustion.
First Law says you gotta use energy to turn the CO2 back into its source hydrocarbons. Second Law says it'll take way more energy than you got out of it in the first place. Using H2 as a fuel skirts that problem, but H2O is a greenhouse gas, too.
posted by 131.184.14...
US EPA vehicle emmissions page
Posts in this Thread:
- New California emissions law, JMC, Tue, 23 Jul 2002 09:30:46
- Be careful what you ask for. You may get it and then, Texron, Tue, 23 Jul 2002 13:29:29
- They need to consider more than just engine emissions.., KeithB, Tue, 23 Jul 2002 11:10:36
- Gray Davis have been on the news for several days>>, Anders, Tue, 23 Jul 2002 10:47:12
- Re: New California emissions law, bRAD, Tue, 23 Jul 2002 10:46:47
- replacing all the old junkers with new SUV's would, MJM , Tue, 23 Jul 2002 10:30:25
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