11.—(1) Each district council shall from time to time cause a review to be conducted of the quality for the time being, and the likely future quality within the relevant period, of air within the council’s district.
(2) Where a district council causes a review under paragraph (1) to be conducted, it shall also cause an assessment to be made of whether air quality standards and objectives are being achieved, or are likely to be achieved within the relevant period, within the council’s district.
(3) If, on an assessment under paragraph (2), it appears that any air quality standards or objectives are not being achieved, or are not likely within the relevant period to be achieved, within the district council’s district, the council shall identify any parts of its district in which it appears that those standards or objectives are not likely to be achieved within the relevant period.