NEW YORK: The United Nation children's agency says two billion children are breathing toxic air risking serious health effects including damage to their lungs, brain and other organs.

A new report from the UNICEF says that globally, 300 million children are exposed to pollution levels more than six times higher than standards set by the World Health Organization.

In new report, UN agency says 600,000 children under the age five die each year of diseases linked to air pollution.

Children face much higher health risks from air pollution than adults. Children breathe twice as quickly, taking in more air in relation to their body weight, while their brains and immune systems are still developing and vulnerable.

Millions more suffer from respiratory diseases that diminish their resilience and affect their physical and cognitive development.