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SO 4 2−, NO 3 − and NH 4 +, which accounted for 54–61% of the total PM mass, were the main fractions of PM 2.5 in haze formation during spring 2013.. Different haze episodes were dominated by different fraction due to meteorological conditions and sources. • Southeasterly air mass favours accumulation of PM and formation of haze.
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Mar 06, 2016 · The steel plants and cement factories scattered across China's Shandong province have made it one of the most contaminated areas of the world's biggest polluter. Chinese smog has silver lining
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