A team of international scientists has discovered large particles laden with nitric acid in the Arctic's stratosphere, or upper atmosphere--particles that may be contributing to the unusually low
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/large-particles-contribute-ozone-loss-over-arctic
[2] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone-layer