(1)The Welsh Ministers must review targets under sections 1 and 2 in accordance with this section.
(2)In carrying out a review, the Welsh Ministers must—
(a)seek advice from persons they consider to be independent and to have relevant expertise, and
(b)have regard to scientific knowledge about air pollution.
(3)If a target under section 1 or 2 is in respect of a pollutant for which guidelines have been published by the World Health Organisation in its most recent global air quality guidelines, the Welsh Ministers must, in carrying out a review of the target, have regard to the guidelines in respect of that pollutant.
(4)Having carried out a review, the Welsh Ministers must lay before Senedd Cymru, and publish, a statement about the steps, if any, they intend to take under section 1 or 2 in relation to each target in consequence of the review.
(5)Where a statement provides that the Welsh Ministers intend to take no steps under sections 1 or 2 in relation to a target, the statement must include the reasons for that decision.
(6)The first review must be completed before the end of 5 years beginning with the day on which the first target is set (whether under section 1 or 2).
(7)Subsequent reviews must be completed before the end of 5 years beginning with the day on which the previous review was completed.
(8)A review is completed when the Welsh Ministers have laid the statement before Senedd Cymru and published it.