Barry was questioning two witnesses about what can be done to combat poor air quality in our cities in the UK.
The two witnesses were: Paul Swinney, (Director of Policy, Centre for Cities); and Subrah Krishnan-Harihara, (Head of Research, Greater Manchester Chamber of Commerce)
Firstly, Barry questioned the wintnesses on why a national framework for clean air zones is needed, rather than the current city by city approach.
The questioning then moved onto why a green recovery from the pandemic will not only be beneficial for the environment and air quality but also for local economies.
The final question was on the power that local authorities have to make the sort of investment and changes needed for improved air quality given all the other challenges they are facing as well.
You can watch the full exchange below.