This picture taken on February 24, 2014 shows visitors wearing masks in Temple of Heaven in haze-covered Beijing. Dangerous smog which has blighted swathes of northern China in recent days has prompted a spike in air purifier sales, local media reported Monday, as pollution continued to shroud Beijing. China’s National Meteorological Centre issued a “yellow” smog alert for much of the country’s north on Monday, the fifth consecutive day of heavy pollution which has slashed visibility and seen pollution reach hazardous levels. CHINA OUT AFP PHOTO

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