The smog is essentially caused by the presence of A. O3 and N2 B. O2 and N2 C. Oxides of N and S D. O2 and O3

The correct answer is C. Oxides of N and S.

Smog is a mixture of air pollutants that form when sunlight reacts with chemicals released from cars, power plants, and other sources. The main components of smog are ground-level ozone, particulate matter, and nitrogen oxides.

Ground-level ozone is a gas that forms when sunlight reacts with nitrogen oxides and volatile organic compounds (VOCs). Ozone is a major component of smog and can cause respiratory problems, heart disease, and cancer.

Particulate matter is a mixture of solid particles and liquid droplets that can be found in the air. Particulate matter can come from a variety of sources, including cars, power plants, and wood burning. Particulate matter can cause respiratory problems, heart disease, and cancer.

Nitrogen oxides are gases that are released from cars, power plants, and other sources. Nitrogen oxides can react with other chemicals in the air to form ground-level ozone and

The other options are incorrect because they do not include the main components of smog. Option A, O3 and N2, does not include particulate matter. Option B, O2 and N2, does not include ground-level ozone or particulate matter. Option D, O2 and O3, does not include nitrogen oxides.