Quote:
Originally Posted by Tom Vaught
Detroit used to have a cloud hanging over it as you neared the city. 1973 time frame.
Obviously a pollution cloud. Air is much better today due to smog reduction.
Tom V.
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Another example: if you look at photos from the 1960s or earlier of most any highway system, there's a dark stripe down the middle of each lane from the oil that was left behind by cars that had no emissions controls like PCV systems.
