Q: 120 (CDS-II/2017)

Which on^ of the following is not included in the National Air Quality Index? a
question_subject: 
Science
question_exam: 
CDS-II
stats: 
0,0,26,7,2,5,12
keywords: 
{'national air quality index': [0, 0, 0, 1], 'nitrogen dioxide': [3, 0, 1, 8], 'methane': [0, 0, 0, 5], 'sulphur': [0, 0, 0, 2], 'lead': [7, 1, 11, 11]}

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