emissions

Emissions are substances that are released into the air from things like cars, factories, and power plants. They can be harmful to the environment and to people's health.

Some common emissions include carbon dioxide, nitrogen oxides, and sulfur dioxide. These emissions can cause smog, acid rain, and climate change.

We can reduce emissions by using less energy, driving less, and using cleaner fuels. We can also plant trees, which help to absorb emissions from the atmosphere.

Greenhouse gas emissions are a major cause of climate change.