By Daniel Hunter
A long-running inquiry into the need for a new airport runway in south east England has resulted in a further delay for more public consultation.
Further evidence on problems caused by air pollution will be taken, due to a decision by Sir Howard Davies, the chairman of the Airports Commission.
Davies' decision comes after a Supreme Court ruling in April, ordering the UK to do more to improve air quality.
The commission has already recommended three options for a new runway.
The consultation will begin immediately and end on Friday 29 May.
The final report was expected next month, but could now be delayed as a result of the consultation.