I have no problem if you have a different opinion than mine, but let me at least tell you why I have mine. I live in Pittsburgh where steel manufacturing was the largest industry for the longest time. Pollution and smog from steel mills was so bad they used to turn street lights on around 1PM so you could see your way through the smog.
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Those are actual pictures of downtown Pittsburgh. However once the steel industry left, the air has become remarkably clean. I don't believe most pollution comes from automobiles, I think it comes from manufacturing and industry. Here is Pittsburgh today on an average summer day-
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Secondly, at least here in PA, only the most populous counties are subject to emissions testing. 42 out of 67 counties in PA don't require emissions. If I lived 2 miles north of where I currently do, I would not be subject to annual emissions testing. If emissions from cars were really that bad, wouldn't they require the test everywhere?
I'm not trying to get too far off topic here, but I'd at least like to justify my opinion.