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(a)     in relation to [local authorities in England and Wales other than local authorities in Greater London, the Secretary of State;]

[(aa)     in relation to local authorities in Greater London, the Mayor of London; and]

(b)     in relation to Scotland, SEPA acting with the approval of the Secretary of State.

(a)     a review of the quality for the time being, and the likely future quality within the relevant period, of air within the area of any local authority;

(b)     an assessment of whether air quality standards and objectives are being achieved, or are likely to be achieved within the relevant period, within the area of a local authority;

(c)     an identification of any parts of the area of a local authority in which it appears that those standards or objectives are not likely to be achieved within the relevant period; or

(d)     an assessment of the respects (if any) in which it appears that air quality standards or objectives are not being achieved, or are not likely