Where a local authority in the area of a combined authority intends to prepare an action plan it must notify the combined authority.
Where a combined authority has been given a notification under subsection (1) by a local authority, the combined authority must, before the end of the relevant period, provide the local authority with proposals for particular measures the combined authority will take to contribute to the achievement, and maintenance, of air quality standards and objectives in the area to which the plan relates.
Where a combined authority provides proposals under subsection (2), the combined authority must—
An action plan prepared by a local authority in the area of a combined authority must set out any proposals provided to it under subsection (2) (including the dates specified by virtue of subsection (3)(a)).
In this section "combined authority" has the meaning it has in Part 6 of the Local Democracy, Economic Development and Construction Act 2009 (see section 120 of that Act).