Without clean air, human beings wouldn't be able to live on Earth. That's why it's so important to protect the environment by ensuring that air pollution is reduced! As readers learn throughout this volume, air pollution can be caused by both natural and manmade emissions, such as the burning of fossil fuels, as well as from the use of industrial and agricultural machines. The harm this has on the air around us is made understandable through helpful photographs and accessible text. Also featured are the various ways readers can help reduce toxic emissions through their own actions.