The correct answer is A. air pollution.
Air pollution is the presence of solid, liquid, or gaseous particles in the air that are harmful to human health and the environment. Air pollution can be caused by natural sources, such as volcanoes and forest fires, or by human activities, such as burning fossil fuels, driving cars, and using industrial chemicals.
Air pollution can cause a variety of health problems, including respiratory infections, heart disease, and cancer. It can also damage crops and ecosystems.
There are a number of things that can be done to reduce air pollution, including:
- Reducing emissions from cars, trucks, and other vehicles
- Using cleaner energy sources, such as solar and wind power
- Planting trees and other vegetation
- Recycling and reducing waste
Air pollution is a serious problem that affects people all over the world. It is important to take steps to reduce air pollution and protect our health and environment.
Here is a brief explanation of each option:
- Air pollution: The presence of solid, liquid, or gaseous particles in the air that are harmful to human health and the environment.
- Water pollution: The contamination of water bodies, such as lakes, rivers, and oceans, with harmful substances.
- Soil pollution: The contamination of soil with harmful substances, such as pesticides, herbicides, and industrial waste.
- Radioactive pollution: The contamination of the environment with radioactive materials, such as uranium and plutonium.