The United Nations Children’s Fund is warning that 300 million of the world’s children regularly breathe highly toxic air pollution, putting them at risk of brain damage, lung disease and premature death. UNICEF’s new report, released today, finds most of the highest-risk children live in northern India. It finds the vast majority of the world’s children—some 2 billion people—are exposed to levels of air pollution considered unhealthy by the World Health Organization. Globally, air pollution is responsible for one out of every eight deaths each year, including some 600,000 children under the age of five.