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My neighborhood, for instance, a block from the beach in Florida, gets most of its pollution from the wind blowing in dust from Africa. Any pollution my car makes is gone from my neighborhood moments later -- on it's way to bother someone else downwind from me.

Also, unless you live in an area with dense traffic, pollution from today's cars is barely measurable and not a big concern.

Of course, for some people in some locations clean air is a priority. We just need to recognize than not everyone is in the same situation.