>The Cat, egr and other stuff are used to reduce the levels of
>NOx(nitrous oxides or the BROWN cloud), Sulfur dioxide and other
>nasties that are not checked for. They are VERY important for Emissions
>reductions. Even though the car passes the HC and CO test, It may put
>out horrendous amounts of other things.
That's not really true Steve. While the 3way cats and egr (on a
carbureted engine) reduce NOx and CO, and the air pump reduces HC,
things like SO2 are purely a result of the fuel, and not controlled in
any way shape or form by the emissions controls of the car. Same the
trace amounts of formaldehide and such. Nothing controls them, and
combustion efficiency don't affect their output much. It seems to me
that you're mixing up concerns with power plant emission outputs with
automobile emissions.
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