Question to the Department for Transport:

To ask the Secretary of State for Transport, whether he has held discussions with Transport for London on the detection of microscopic metallic particles in the air across the London Underground.

Transport in London is devolved to the Mayor of London and Transport for London (TfL). The Department has regular discussions with TfL on a range of issues, however, the management of air quality on the London Underground is a matter solely for them. More widely, responsibility for air quality within London is devolved from the Secretary of State to the Mayor of London.