> The operation of the gas pump itself pollutes the air with toxic fumes, to the point where CA already bans their installation 300 ft from sensitive uses (e.g. schools and playgrounds) and even that may not be sufficient to actually prevent health hazards.

That's another result of fuel consumption, not the construction of new gas stations. The toxic fumes aren't reduced because a driver goes an extra couple minutes out of their way to use one of the existing stations.

The goal is to reduce automotive emissions. Gas stations don't incentivize automotive emissions - it's the other way around.