Q: 1 (CDS-I/2013)

Which one among the following has been included as a parameter for the first time under the National Ambient Air Quality Standards (NAAQS), based on Central Pollution Control Board and IIT, Kanpur research, WHO guidelines and European Union limits and practices ?
question_subject: 
General Knowledge
question_year: 
2013
question_exam: 
CDS-I
stats: 
0,2424,2552,1048,736,2424,768