My Lords, in the midst of all this great technical expertise, I would like to follow up one point that the noble Baroness, Lady Walmsley, touched on, which is how all this will be achieved. This amendment asks that a further metric be added to those already in the Bill. The Secretary of State is tasked with setting targets for the annual mean level in ambient air, and an amazing combination of statistics will be needed to get that.
Clause 17 asks the Secretary of State to prepare a policy statement, but who is actually going to produce all these measures? The noble Lord, Lord Whitty, hinted at what local authorities could do, but is the Government’s policy to pile all these tasks on to local government? Who will be blamed if the measures are not produced? Are the Government considering what the financial demands are likely to be? The noble Baroness, Lady Finlay, has given us some indication that they may be considerably more than is currently the case.