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During or after?
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Pollution caused by restarts is because of fuel wasted trying to get the engine spinning. Starter motors typically aren't powerful enough to start the engine wiithout some assistance from the combustion itself. So, with most motors, the fuel maps are run extra rich at start-up and when cranking.
Mazda minimizes this by priming a cylinder with fuel for the restart under iStop. But it still requires fuel to start the engine.
You don't have this problem with a bump-start. The motive force for the engine comes from the tires, not the starter or the motor itself... and that's more than enough.
Bump-start: No fuel enrichment mode. Just a seamless move between engine off and engine on...
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