Analysis of Aerosol Optical Depth (AOD) from the Moderate Resolution Imaging Spectroradiometer (MODIS) found an increasing trend from 2004 to 2007 followed by a more gradual decrease from 2008 to 2013 13 .
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Satellite NO<sub>2</sub> retrievals suggest China has exceeded its NO<sub>x</sub> reduction goals from the twelfth Five-Year Plan.
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