My Lords, I have not had a conversation with the mayor. That answers the first of the noble Lord’s questions. Congestion charging has had some effect, but not a great deal, on air pollution. We use a combination of factors such as encouraging people to use bicycles, to walk or to drive vehicles which do not use the worst kinds of fuels—all play a part. We need to use a combination of factors.
My Lords, does the Minister agree that, rather than asking people to stay indoors during high pollution episodes, it would be better to give that advice to drivers of highly polluting vehicles and for them to stay at home?
The noble Baroness makes a very important point.