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© 2020 Wiley-VCH Verlag GmbH Co. KGaA, Weinheim.Complex urban air quality has long been assessed by a single (or major) contaminant, e.g., fine particulate matter (PM2.5 ), but scant attention has been given to multicontaminant air pollution, especially in countries with severe air pollution, e.g., China. We thus proposed an improved method for quantifying both single- and multicontaminant air pollution. Our approach uses China's major cities as an example, as they have an operational national urban air quality monitoring network.