Will the Cabinet Secretary confirm when the data from the Welsh Government's trial extension of the 50mph zone past Port Talbot and Swansea on the M4 motorway be made public?
Answered by Cabinet Secretary for Economy and Transport | Answered on 14/11/2018
The effect of the measures on NO2 concentrations at the five trial 50mph locations is currently being monitored by diffusion tubes. This will be supplemented with continuous monitoring using reference method analysers by the New Year.
The earliest date that a full set of validated annual data will be available is September 2019 and the information will be published thereafter.