Schedule 6 Critical levels for the protection of vegetationI1

Northern Ireland

Critical levels for the protection of vegetation

Averaging period	Critical level
Sulphur dioxide: Calendar year and winter (1 October to 31 March)	20 µg/m³
Oxides of nitrogen: Calendar year	30 µg/m³NO_x

Averaging period

Critical level

Sulphur dioxide:

Calendar year and winter (1 October to 31 March)

20 µg/m³

Oxides of nitrogen:

Calendar year

30 µg/m³NO_x

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