Must Reads: The war on Southern California smog is slipping. Fixing it is a $14-billion problem - Los Angeles Times
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Beijing smog: which industries were among the worst offenders, according to 2,000 top Chinese scientists? | South China Morning Post
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Smoke is discharged from chimneys at a factory in heavy smog in Taiyuan city, north China's Shanxi province, 6 January 2017. China's top environment Stock Photo - Alamy
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