Fig. 2 NH3, NOx, SO2, and NMVOC emission changes triggered by the JJJ clean air policy. NH3, NOx, SO2, and NMVOC emission changes triggered by the JJJ.

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Fig. 2 NH3, NOx, SO2, and NMVOC emission changes triggered by the JJJ clean air policy. NH3, NOx, SO2, and NMVOC emission changes triggered by the JJJ clean air policy. Green bars show the decrease in NH3, NOx, SO2, and NMVOC emissions in JJJ, and blue bars show the increase in PM2.5 emissions in other regions, with regions shaded according to total NH3, NOx, SO2, and NMVOC emissions. Delin Fang et al. Sci Adv 2019;5:eaav4707 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).