Question: Which of the following is an example of a secondary pollutant?

Question: Which of the following is an example of a secondary pollutant?

A. lead which is released into the atmosphere by burning coal

B. CFCs which deplete our ozone layer when they escape into the atmosphere

C. nitric acid which forms by the reaction of nitrous oxide with water in the atmosphere

D. dust (aerosol) particles as a result of the drying up of local lakes