Sulphur Dioxide in ambient air can affect human health, particularly in those suffering from asthma and chronic lung diseases and exacerbates respiratory symptoms. It also causes visibility impairment. It is considered more harmful when particulate and other pollution concentrations are high.
The top ten cities (million plus population) with respect to sulphur dioxide level in air were Dombivali/Ambernath (Maharashtra), PimpriChinch wad (Maharashtra), Ghaziabad (Uttar Pradesh), Navi Mumbai (Maharashtra), Pune (Maharashtra), Ranchi (Jharkhand), Thane (Maharashtra), Surat (Gujarat), Dhanbad (Jharkhand) and Rajkot (Gujarat) in 2017.
Annual average concentration of sulphur dioxide was 27 micrograms/m3 in Dombivali/Ambernath (Maharashtra) in 2017 followed by 24 micrograms/m3 in PimpriChinch wad (Maharashtra), 22 micrograms/m3 in Ghaziabad (Uttar Pradesh), 22 micrograms/m3 in Navi Mumbai (Maharashtra)and 21 micrograms/m3 in Pune (Maharashtra).
Sulphur Dioxide annual average concentration was 19 micrograms/m3 in Ranchi (Jharkhand) followed by 18 micrograms/m3 in Thane (Maharashtra), 16 micrograms/m3 in Surat (Gujarat) in 2017, 15 micrograms/m3 in Dhanbad (Jharkhand), 15 micrograms/m3 in Rajkot (Gujarat) in 2017.
Note: RAJYA SABHA SESSION – 246 UNSTARRED QUESTION No 1331; NA: Not Available; ‘Srinagar’ city’s monitoring station is sanctioned but not yet operational, hence data not available; National Ambient Air Quality Standard (NAAQS) for Residential, Industrial, Rural and others Areas (Annual average) for SO2 = 50 micrograms/m3, NO2 = 40 micrograms/m3, PM10 = 60 micrograms/m3 & PM2.5 = 40 micrograms/m3 and SO2 = 20 micrograms/m3, NO2 = 30 micrograms/m3, PM10 = 60 micrograms/m3and PM2.5 = 40 micrograms/m3 for Ecologically sensitive area. The data furnished in the table for year 2017 is as available on date.
Resource Title: State/City-wise Air Quality Status of Million Plus Cities from 2015 to 2017 (Annual average in micrograms/m3) (From : Ministry of Environment, Forest and Climate Change)