Which one of the following is not a secondary pollutant ?

examrobotsa's picture

Submitted by examrobotsa on

Q: 73 (UPPSC/2014)

Which one of the following is not a secondary pollutant ?

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,52,67,27,18,52,22

keywords: 

{'sulphur dioxide': [0, 0, 0, 1], 'ozone': [3, 0, 3, 5], 'smog': [1, 0, 0, 1]}