[Shotimes] emissions question

[Steve Weinrich]

Most pollutants are measured in a given volume or mass per mile, unless it
is better expressed as a ratio.

Did your student note that many testing programs are shifting to OBD-II
testing only instead of actually measuring tailpipe emissions on a chassis
dyno?  If he did, he found the real farce in the evolution of "clean air"
testing.

Steve



----- Original Message -----
From: "van Oss" <vanOss@centurytel.net>
To: <shotimes@autox.team.net>
Sent: Monday, April 19, 2004 3:26 PM
Subject: [Shotimes] emissions question


> I teach public speaking.  A student gave a speech that has raised
questions
> about emissions testing.  Please help.  I live in a small city with no
> testing.  To those who live in an area with emissions testing:
>
> Test results, and numbers required to pass, are all expressed in terms of
> percentages, are they not?  I mean, percentages as opposed to absolute
> amounts of various compounds per mile?  So a vehicle with a larger volume
of
> exhaust output might score well on percentages, but actually put out more
> total volume of these compounds --- when compared with, say,  a vehicle
with
> a smaller exhaust volume but percentage-wise "dirtier" emissions?
>
> Any help appreciated.
>
> VO
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