The correct answer is D. All of the above.
Automobile exhaust is a major source of air pollution. It contains carbon monoxide, nitrogen oxides, and hydrocarbons, which can cause respiratory problems, heart disease, and cancer. Forest fires also release large amounts of pollutants into the air, including carbon monoxide, particulate matter, and hydrocarbons. Bacterial action in soil and swamp areas can produce methane, a greenhouse gas that contributes to climate change.
Air pollution is a major environmental problem that can have serious health consequences. It is important to reduce air pollution by reducing emissions from automobiles, power plants, and other sources. We can also protect our health by staying indoors when air quality is poor and by wearing masks when we are outdoors.
Here are some additional details about each of the options:
- Automobile exhaust: Automobile exhaust is a major source of air pollution. It contains carbon monoxide, nitrogen oxides, and hydrocarbons, which can cause respiratory problems, heart disease, and cancer. Carbon monoxide is a colorless, odorless gas that can be deadly if inhaled in high concentrations. Nitrogen oxides can cause respiratory problems, heart disease, and cancer. Hydrocarbons can react with other pollutants in the air to form smog.
- Forest fire: Forest fires also release large amounts of pollutants into the air, including carbon monoxide, particulate matter, and hydrocarbons. Carbon monoxide is a colorless, odorless gas that can be deadly if inhaled in high concentrations. Particulate matter is a mixture of solid particles and liquid droplets that can be harmful to human health. Hydrocarbons can react with other pollutants in the air to form smog.
- Bacterial action in soil and swamp areas: Bacterial action in soil and swamp areas can produce methane, a greenhouse gas that contributes to climate change. Methane is a colorless, odorless gas that is more potent than carbon dioxide as a greenhouse gas.