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In China, nitrate (NO3-) becomes the key factor to good particles (PM2.5) because the emissions of the predecessor, nitrogen oxides (NOx), are not recognized and controlled really in the past few years. In this work, resources, transformation, and geographic beginning of NOx had been translated incorporating the isotopic information (δ15N and δ18O) of NO3- and double modelling at five Chinese megacities (Beijing, Shanghai, Guangzhou, Wuhan and Chengdu) during 2013-2014. Results revealed that