More than 60 schools across Norfolk have potentially dangerous levels of air pollution
Experts say it could lead to health problems for children
67 schools across Norfolk have potentially dangerous levels of air pollution, according to the British Lung Foundation.
A study done by the charity shows more than a quarter of schools and colleges in England have pollution levels higher than World Health Organisation guidelines.
In 2013, nine-year-old Ella Kissi-Debrah from South London died of asthma - but was the first time that 'exposure to air pollution' had been listed on a death certificate.
Zak Bond, who's policy and public affairs officer at the British Lung Foundation, says it's cases like this that show us how serious the problem is.
He says:
"When you hear the real life stories of people like Ella and also older people who have a lung condition and say that they're trapped in their home and they're scared to leave.
"They're scared if they do go out, they'll have an asthma attack or an attack of their COPD. And that really brings home how serious air pollution can be."