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And because of the influence it can have on flywheel torque, let's spend a few ... The Conversation on MSN: How California’s war on smog and its ambitious car pollution rules made everyone’s air cleaner Cars on the road today are 99% cleaner than they were in 1970. Air quality in the United States is much, much better as a result. In Los Angeles, where I live, lead levels in the air were 50 times ...
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