Opinion
21don MSNOpinion
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 ...
(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Ann E. Carlson, University of California, Los Angeles (THE CONVERSATION) Cars on the ...
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