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Verify: Was Denver’s air quality even worse than Beijing’s this week? – 9NEWS.com

9NEWS.comThe haze over Denver has affectionately been referred to as the “brown cloud.” Professor Alex Huffman teaches chemistry at the University of Denver. He said the “brown cloud” has been around for decades. “In the back of old textbooks, you can look up … and more …read more Source:: Denver, Colorado News From Google News

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