Who has the worst air quality?
There is a town in China. The city of Zhengzhou in China. There is a town in China. There is a town in China. Weinan, China. Pingdingshan is in China. Saudi Arabia. Linfen, China. Even though Linfen was the most polluted city in the world twelve years ago, Beijing was making efforts to curb the city's coal-burning addiction. Is that correct?
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