Secondary air pollution is:

CO3
HNO3
CO2
All the above
HNO3  
Soil Science Author: rikazzz

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2 responses to “Secondary air pollution is:”

  1. Rizwan Avatar
    Rizwan

    CO2 is primary pollutant not secondary so All of above is not the right answer.

    Reply
    1. rikazzz Avatar
      rikazzz

      corrected

      Reply