PART 3Duties of Northern Ireland departments in relation to limit values etc
Duty in relation to long-term objectives for ozone21
1
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.
2
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—
a
ensure that they continue to be met;
b
maintain the best ambient air quality compatible with sustainable development; and
c
maintain a high level of protection for the environment and human health.