Where a local authority in Greater London is preparing an action plan, the Mayor of London (referred to in this section as “the Mayor”) shall, within the relevant period, submit to the authority proposals for the exercise (so far as relating to the designated area) by the Mayor, in pursuit of the achievement of air quality standards and objectives, of any powers exercisable by the Mayor.

Where the Mayor submits proposals to a local authority in pursuance of subsection (1) above, he shall also submit a statement of the time or times by or within which he proposes to implement each of the proposals.