The prime minister says he will look into forever chemical contamination near a former RAF base.
Residents' concerns about so-called "forever chemicals" at a site of a proposed development are raised.
Developers say the development at Heyford Park, near Bicester, could house more than 25,000 people.
Dorchester Living wants to build 6,000 homes on the site at the former RAF Upper Heyford air base.
Older cars increasingly cannot drive in city centre low-emission zones, but Everrati believes it has the solution.
