Some months ago Prime Minister, Narendra Modi launched the air quality index at a two-day conference that included the environment and forest ministers from all Indian states.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pollution-levels-shillong
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/shillong-times-shillong
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/meghalaya
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/shillong
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi