1) Greenpeace
2) Organisation for Economic Co-operation and Development(OECD)
3) World Health Organization(WHO)
4) United Nations Educational, Scientific and Cultural Organization(UNESCO)
Explanation:
Non-governmental environmental organization, Greenpeace released a report titled “Global SO2 emission hotspot database: Ranking the world’s worst sources of SO2 pollution”. It is written by Sunil Dahiya and Lauri Myllyvirta.