ar ôl paragraff (d) mewnosoder—

“(e)

that a local authority in Wales has failed to carry out a measure specified in an action plan by the date specified in the plan in relation to that measure, or

(f)

that an air quality standard or objective has not been achieved, within a designated area in Wales, by the date specified in the action plan for the area as the date by which the standard or objective is expected to be achieved,”.