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Origins of air pollution and contribution to deaths. (a) Relative contribution of different sources to the emission of NOX, SO2, PM2.5, and PM10 in the US for the year 2014 [7]. (b) Relative contribution of outdoor air pollution sources to premature death in the US for the year 2010 [9]. (c) Estimated contributions of global air pollution risk factors to deaths caused by noncommunicable disease for the years 1990–2015 [10].
