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Nature“Scientific Reports” just published a study "India is overtaking China as the world's largest emitter of anthropogenic sulfur dioxide” based on OMI satellite retrieval backed by aircraft measurements Zhanqing Li's Group made in China shows that SO2 emission has reduced by 75% over the last 10 years. Meanwhile, India has increased by 50% to become the MOST emitter of SO2 in the world. Given the recent severe haze event in India when several major diplomatic events taking place there, the study has drawn world-wide attention including Xinhua News Agency.  
https://news.sina.cn/2017-11-10/detail-ifynrsrf3542298.d.html?from=wap

(文章链接)
http://meto.umd.edu/~zli/PDF_papers/Li_et_al-2017-SR.pdf