How clean is the air we breathe? What gases do cars and factories produce? Is it true that gases, dust, and other types of pollution in the air can make us ill? What is acid rain, and why does it hurt animals and plants? Can switching off a light and taking the bus instead of riding in the car really help make the air cleaner? Dirty Air introduces young readers to the issue of air pollution, which is caused by car exhaust, power plants, factories, and other sources. In addition, it gives students plenty of ideas about how to use less electricity and oil to help cut down on air pollution and make our world greener and cleaner for the future. Filled with information perfectly suited to the abilities and interests of an early elementary audience, this colorful, fact-filled volume includes grade-appropriate activities and experiments, critical-thinking questions, and fascinating fact boxes to keep the pace lively and interactive.