Article 3 2

(a)

in combustion plants which fall within the scope of Directive 2001/80/EC, which are subject to Article 4(1) or (2) or point (a) of Article 4(3) of that Directive and which comply with the emission limits for sulphur dioxide for such plants as set out in that Directive;

(b)

in combustion plants which fall within the scope of Directive 2001/80/EC, which are subject to point (b) of Article 4(3) and Article 4(6) of that Directive and the monthly average sulphur dioxide emissions of which do not exceed 1 700 mg/Nm3 at an oxygen content in the flue gas of 3 % by volume on a dry basis;

(c)

in combustion plants which do not fall under points (a) or (b), and the monthly average sulphur dioxide emissions of which do not exceed 1 700 mg/Nm3 at an oxygen content in the flue gas of 3 % by volume on a dry basis;

(d)

for combustion in refineries, where the monthly average of emissions of sulphur dioxide averaged over all combustion plants in the refinery, irrespective of the type of fuel or fuel combination used, but excluding plants which fall under points (a) and (b), gas turbines and gas engines, does not exceed 1 700 mg/Nm3 at an oxygen content in the flue gas of 3 % by volume on a dry basis.