Regulation 21 Duty in relation to long-term objectives for ozoneI1

Northern Ireland departments shall ensure that all necessary measures not entailing disproportionate cost are taken to attain the long-term objectives for ozone set out in Schedule 4.

In zones where the long-term objectives for ozone have been attained, Northern Ireland departments shall, insofar as factors including meteorological conditions and the transboundary nature of ozone pollution permit—