> -----Original Message-----
> From: owner-dakota-truck@bent.twistedbits.net
> [mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of
> Bernd D. Ratsch
> Sent: Friday, January 04, 2008 11:42 AM
> To: dakota-truck@dakota-truck.net
> Subject: Re: DML: Smog failure, a little help please
>
>
> San Jose/Santa Clara is a prime example. I was involved in
> the transition years for the smog checks and yes, the air
> quality there has definitely improved over the past 20 years.
> Austin has also improved already and that's just with simple
> maintenance that's normally neglected. Are the vehicles
> entirely at fault for the excessive emissions....nope - you
> can thank the large processing and chemical plants for that one.
>
Ohio has 14 e-check counties. I did a quick Google search and found some
stuff from the Ohio EPA. There is a greater decrease in ozone (a
byproduct of hydrocarbon and NOx decomposition) in Ohio counties where
emissions checks are done than where they are not done. It lacks a few
things normally present in scientific presentations. p-values? Slope?
It's more of an executive summary anyway.
http://www.otterbein.edu/home/fac/tpindell/ozone.jpg
taken from:
http://www.epa.state.oh.us/dapc/echeck/docs/MSS_AR2000.pdf
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