Shanghai on Sunday lifted its air pollution alert as heavy smog that had lasted for days started to clear, Xinhua news agency reported. The city remained hazy on Sunday morning but the city’s weather center said the low visibility was more a result of fog rather than the fine particles in smog. The city’s air quality stood at “medium pollution” on Sunday, but environmental officials said a cold front would bring strong winds on Monday to clean up the air. The development brought relief to the city, which saw the Air Quality Index (AQI) topping 500 in certain areas. An AQI of over 300 is considered “serious pollution”. The China Meteorological Center on Sunday upgraded its smog alert to orange, the second highest in its four-tier warning system, as it warned of heavy smog in the provinces of Jiangsu, Zhejiang, Anhui, Hebei and Shandong, the report said.
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