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The Integrated Assessment of Black Carbon and Tropospheric Ozone addresses the short-lived cli- mate forcers (SLCFs) that also have an impact on air quality. Its findings on both the state of scientific knowledge and existing policy options to cut emissions come from 50 authors convened by UNEP and WMO. Previous assessments have often studied either the impacts on climate from such pollutants or the direct effects of air pollution on human health and ecosystems, but not both in an integrated manner. This report gives a comprehensive assessment of the multiple benefits of practi- cal measures to reduce emissions of black carbon – a key component of soot – and the gases leading to the formation of tropospheric ozone, especially methane.