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I'd be willing to be (a whole shiny nickel!!) that we do pollute more just after a bump-start than someone does during steady-state cruising. I'd be surprised if it were more during a P&G cycle (or better yet, a long stop light!) than would be emitted during that whole steady-state cruise, or idling at the light.
The exhaust of my CRX gets black quickly. I attribute that to running slightly rich after bump-starts.
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