It's hard to escape air pollution these days. Exhaust from cars and trucks, smoke from factories and wildfires, and even dust and pollen can make it hard to breathe. Air pollution is one of the causes of climate change. Find out what is being done to reduce air pollution and make the planet a cleaner, safer place. Level 3 readers are aimed at children who are reading by themselves and can grasp new concepts. Key words and captions help readers understand new vocabulary and more challenging sentence structure. This project has been made possible in part by the Government of Canada.