Short-term action plans
21.—(1) Where, in any zone, there is a risk that the level of sulphur dioxide or nitrogen dioxide will exceed one or more of the alert thresholds set out in Schedule 4, the Welsh Ministers must draw up and implement a short-term action plan.
(2) A short-term action plan must set out the measures intended to reduce the risk of the alert thresholds being exceeded, or, in the event of those thresholds being exceeded, to reduce the duration of such an incident.
(3) Where, in any zone, the level of ozone exceeds the alert threshold set out in Schedule 4 or there is a risk that it will exceed that threshold, the Welsh Ministers must draw up and implement a short-term action plan taking into account Decision 2004/279/EC(1), if of the opinion that it is reasonably likely that the risk, severity or duration of such an incident can be reduced taking into account geographical, meteorological and economic conditions.
(4) For the purposes of paragraph (3), the level must exceed or be predicted to exceed the alert threshold for at least three consecutive hours.
(5) Short-term action plans may also be drawn up where there is a risk that any of the limit values or target values set out in Schedules 1 and 2 will be exceeded.
OJ No. L 87, 25.3.04, p. 50.