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Smog on a typical day in Xi’an, located in Shaanxi province. (Image credit: Shwangtianyuan via Wikipedia)   It’s no secret China has cities shrouded in smog, so much so that pollution from mainland China has forced western cities in Japan to issue health warnings and has even been detected as far away as California. While that may seem terrible in terms of health hazards, China, is in fact, not the most significant smog producer in the world- Pakistan takes that honor with an a ...