The National Air Quality Index (AQI) for Visakhapatnam has been ranked 'satisfactory' considering the values of eight pollutants measured by the Central Pollution Control Board (CPCB).
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/breathe-easy-vizag-tirupati
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-hyderabad
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/andhra-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vishakhapatnam-t
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi