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You have some exposure, but unless you're exposed to elevated levels ~24/7/365 it isn't as much of a concern as living by, for instance, the LA harbor, with the emissions from ships, equipment, and thousands or trucks coming through every day, that tends to sit there thanks to local weather. Statistically speaking living in the most polluted areas is like having everyone smoke a quarter of a pack per day for most of the year or something.
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