Question to the Department for Transport:
To ask the Secretary of State for Transport, what assessment he has made of the effect on air quality of increasing the capacity of the M4 between junctions 3 and 4 by creating a tunnel for additional traffic.
The Department for Transport has not carried out an assessment of the effect on air quality of increasing the capacity of the M4 between junctions 2 and 4 by creating a tunnel for additional traffic.