What is the percentage of anthropogenic sulphur emission in total sulphur emissions to the atmosphere??

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Sergio Ibarra

Too ambiguous.

Janusz Pudykiewicz

Natural sulphur emission is summarized in:

http://www.tandfonline.com/doi/pdf/10.1080/10473289.1990.10466701

whereas the extensive estimates of the anthropogenic emission are presented in the following review article

https://www.atmos-chem-phys.net/11/1101/2011/acp-11-1101-2011.pdf

Based on these two sources you can easily derive the estimate of a ratio.

I hope that this information will provide an approximate answer to your question.