A IR: THE BREATH OF LIFE... All life on the planet depends on healthy air to breathe, with just the right mix of oxygen for animals and carbon dioxide for plants. Our air also contains some things that are harmful to plants and animals, some of which are natural, and some of which are put there by the activities of people. Air pollutants affect not only the air we breathe, but also the water we drink and the food we eat. With ever increasing numbers of people and industrial activities on the planet, it becomes more important every day for us to find ways to keep our air quality the best it can be for the sake of healthy people, animals, plants and ecosystems. Outdoor air quality depends on controlling air pollution emissions from industry, agriculture and cars. Indoor air quality depends on using building materials and ventilation systems that limit exposure to toxic chemicals within our indoor air spaces.