Drivers are inhaling cancer-causing chemicals in their cars.
New research has revealed that motorists are at risk of breathing in harmful flame retardants that are known or suspected to cause the disease.
Scientists say that car manufacturers add the toxic chemicals to seat foam and other materials in order to meet "outdated" fire safety standards.
Dr. Rebecca Hoehn, lead author of the study at Duke University in the US, said: "Our research found that interior materials release harmful chemicals into the cabin air of our cars.
"Considering the average driver spends about an hour in the car every day, this is a significant public health issue. It's particularly concerning for drivers with longer commutes as well as child passengers, who breathe more air pound for pound than adults."