Introduction:
The burning of fossil fuels is a major source of air pollution and greenhouse gas emissions. When fossil fuels such as coal, oil, and natural gas are burned, they release various pollutants into the atmosphere. However, one of the options listed, oxygen (O2), is not produced by the burning of fossil fuels.

Why is oxygen not produced by the burning of fossil fuels?
Oxygen is a vital component for the process of combustion, which occurs when fossil fuels are burned. During combustion, the oxygen in the air reacts with the carbon and hydrogen in the fuel to produce carbon dioxide (CO2) and water vapor (H2O). This means that the oxygen used in the combustion process is already present in the air and is not produced as a result of burning fossil fuels. Therefore, option B, oxygen, is not produced by the burning of fossil fuels.

What are the other products of burning fossil fuels?
1. Carbon dioxide (CO2): This is the primary greenhouse gas emitted during the combustion of fossil fuels. It is released into the atmosphere and contributes to global warming and climate change.

2. Nitrogen oxides (NOx): These are produced when nitrogen in the air reacts with oxygen at high temperatures during combustion. Nitrogen oxides contribute to the formation of smog and acid rain, and they also play a role in the depletion of the ozone layer.

3. Sulfur dioxide (SO2): This is produced when fossil fuels containing sulfur are burned. Sulfur dioxide contributes to the formation of acid rain and can have harmful effects on human health and the environment.

Conclusion:
In conclusion, while the burning of fossil fuels releases various pollutants into the atmosphere, including carbon dioxide, nitrogen oxides, and sulfur dioxide, it does not produce oxygen. Oxygen is already present in the air and is consumed during the combustion process. Understanding the products of burning fossil fuels is important in order to address the environmental and health impacts associated with this activity.