As per Indian Institute of Tropical Meteorology, Pune air is posing a threat to the health of citizens as it has 1 micro meter particulate matter in it.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pune-air-poses-health-threat-citizens
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-pune
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pune-t
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diwali
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-tropical-meteorology
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution