An important example of a secondary pollutant is___Question 6Answera.Ash from Volcanic erruptionb.carbon dioxidec.Nitrogen oxided.ground level ozone

To determine which option represents an important example of a secondary pollutant, let's analyze the choices given:

1. Definition of Secondary Pollutants: Secondary pollutants are not emitted directly into the atmosphere but form in the air through chemical reactions involving primary pollutants.

2. Analysis of Options:

   • a. Ash from Volcanic Eruption: This is a primary pollutant as it is released directly from volcanic activity.
   • b. Carbon Dioxide (CO₂): This is also a primary pollutant, primarily emitted through combustion processes.
   • c. Nitrogen Oxides (NOx): These are primarily emitted from vehicles and industrial processes, making them primary pollutants.
   • d. Ground Level Ozone (O₃): This is a secondary pollutant formed by chemical reactions between nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight.

Conclusion

Considering the definitions and analysis of the options, the best answer for an important example of a secondary pollutant is:

d. ground level ozone.