Which of the following causes Ground Level Ozone?

Which of the following causes Ground Level Ozone?
[A]Carbon monoxide
[B]Oxides of nitrogen
[C]Sulphur dioxide
[D]Carbon dioxide

Oxides of nitrogen
Ground level ozone is created by chemical reactions between oxides of nitrogen (Nox) and volatile organic compounds (VOC) in the presence of sunlight. Emissions from industrial facilities and electric utilities, motor vehicle exhaust, gasoline vapors, and chemical solvents are some of the major sources of Nox and VOC. Breathing ozone can trigger a variety of health problems, particularly for children, the elderly, and people of all ages who have lung diseases such as asthma. Ground level ozone can also have harmful effects on sensitive vegetation and ecosystems.

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