Chapter Tables F1

Table 1

Emission limit values (mg/Nm³) for existing medium combustion plants with a rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW, other than engines and gas turbines

(1) The value does not apply in the case of plants firing exclusively woody solid biomass.
(2) 300 mg/Nm³ in the case of plants firing straw.
(3) 400 mg/Nm³ in the case of low calorific gases from coke ovens in the iron and steel industry.
Pollutant	Solid biomass	Other solid fuels	Gas oil	Liquid fuels other than gas oil	Natural gas	Gaseous fuels other than natural gas
SO₂	200^f1^f2	1100	-	350	-	200^f3
NO_x	650	650	200	650	250	250
Dust	50	50	-	50	-	-

Table 2

Emission limit values (mg/Nm³) for existing medium combustion plants with a rated thermal input greater than 5 MW, other than engines and gas turbines

(1) The value does not apply in the case of plants firing exclusively woody solid biomass.
(2) 300 mg/Nm³ in the case of plants firing straw.
(3) 1,100 mg/Nm³ in the case of plants with a rated thermal input greater than 5 MW and less than or equal to 20 MW.
(4) Until 1 January 2030, 850 mg/Nm³in the case of plants with a rated thermal input greater than 5 MW and less than or equal to 20 MW firing heavy fuel oil.
(5) 400 mg/Nm³ in the case of low calorific gases from coke ovens, and 200 mg/Nm³ in the case of low calorific gases from blast furnaces, in the iron and steel industry.
(6) 170 mg/Nm³ in the case of biogas.
(7) 50 mg/Nm³ in the case of plants with a rated thermal input greater than 5 MW and less than or equal to 20 MW.
Pollutant	Solid biomass	Other solid fuels	Gas oil	Liquid fuels other than gas oil	Natural gas	Gaseous fuels other than natural gas
SO₂	200^f4^f5	400^f6	-	350^f7	-	35^f8^f9
NOx	650	650	200	650	200	250
Dust	30^f10	30	-	30	-	-

Table 3

Emission limit values (mg/Nm ³) for existing engines and gas turbines

(1) 60 mg/Nm³ in the case of biogas.
(2) 130 mg/Nm³ in the case of low calorific gases from coke ovens, and 65 mg/Nm³ in the case of low calorific gases from blast furnaces, in the iron and steel industry.
(3) 1,850 mg/Nm³in the following cases—
(i) for diesel engines the construction of which commenced before 18 May 2006,
(ii) for dual fuel engines in liquid mode.
(4) 250 mg/Nm³ in the case of engines with a rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.
(5) 250 mg/Nm³ in the case of engines with a rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW,
225 mg/Nm ³ in the case of engines with a rated thermal input greater than 5 MW and less than or equal to 20 MW.
(6) 380 mg/Nm³ for dual fuel engines in gas mode.
(7) Emission limit values are only applicable above 70 % load.
(8) 20 mg/Nm³ in the case of plants with a rated thermal input equal to or greater than 1 MW and less than or equal to 20 MW.
Pollutant	Type of medium combustion plant	Gas oil	Liquid fuels other than gas oil	Natural gas	Gaseous fuels other than natural gas
SO₂	Engines and gas turbines	-	120	-	15^f11^f12
NO_x	Engines	190^f13^f14	190^f15	190^f16	190
NO_x	Gas Turbines^f17	200	200	150	200
Dust	Engines and gas turbines	-	10^f18	-	-

Table 4

Emission limit values (mg/Nm³) for new combustion plants other than engines and gas turbines

(1) The value does not apply in the case of plants firing exclusively woody solid biomass.
(2) Until 1 January 2025, 1700 mg/Nm³ in the case of plants which are part of SIS or MIS.
(3) 400 mg/Nm³ in the case of low calorific gases from coke ovens, and 200 mg/Nm³ in the case of low calorific gases from blast furnaces, in the iron and steel industry.
(4) 100 mg/Nm³ in the case of biogas.
(5) 500 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.
(6) Until 1 January 2025, 450 mg/Nm³ when firing heavy fuel oil containing between 0.2 % and 0.3 % N and 360 mg/Nm³ when firing heavy fuel oil containing less than 0.2 % N in the case of plants which are part of SIS or MIS.
(7) 50 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW; 30 mg/Nm³ in the case of plants with a total rated thermal input greater than 5 MW and less than or equal to 20 MW.
(8) 50 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.
Pollutant	Solid biomass	Other solid fuels	Gas oil	Liquid fuels other than gas oil	Natural gas	Gaseous fuels other than natural gas
SO₂	200^f19	400	-	350^f20	-	35^f21^f22
NO_x	300^f23	300	200	300^f24	100	200
Dust	20^f25	20	-	20^f26	-	-

Table 5

Emission limit values (mg/Nm ³) for new engines and gas turbines

(1) Until 1 January 2025, 590 mg/Nm³for diesel engines which are part of SIS or MIS.
(2) 40 mg/Nm³ in the case of biogas.
(3) Engines running between 500 and 1,500 hours per year may be exempted from compliance with those emission limit values if they are applying primary measures to limit NOx emissions and meet the emission limit values set out in footnote (4).
(4) Until 1 January 2025 in SIS and MIS, 1,850 mg/Nm³ for dual fuel engines in liquid mode and 380 mg/Nm³ in gas mode; 1,300 mg/Nm³ for diesel engines with ≤ 1200 rpm with a total rated thermal input less than or equal to 20 MW and 1,850 mg/Nm³ for diesel engines with a total rated thermal input greater than 20 MW; 750 mg/Nm³ for diesel engines with > 1,200 rpm.
(5) 225 mg/Nm³ for dual fuel engines in liquid mode.
(6) 225 mg/Nm³ for diesel engines with a total rated thermal input less than or equal to 20 MW with ≤ 1,200 rpm.
(7) 190 mg/Nm³ for dual fuel engines in gas mode.
(8) These emission limit values are only applicable above 70 % load.
(9) Until 1 January 2025, 550 mg/Nm³for plants which are part of SIS or MIS.
(10) Until 1 January 2025, 75 mg/Nm³ for diesel engines which are part of SIS or MIS.
(11) 20 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.
Pollutant	Type of medium combustion plant	Gas oil	Liquid fuels other than gas oil	Natural gas	Gaseous fuels other than natural gas
SO₂	Engines and gas turbines	-	120^f27	-	15^f28
NO_x	Engines^f29^f30	190^f31	190^f32	95^f33	190
NO_x	Gas turbines^f34	75	75^f35	50	75
Dust	Engines and gas turbines	-	10^f36^f37	-	-

Annotations

Textual amendments

F1: Sch. 27 inserted (1.11.2025) by The Environmental Authorisations (Scotland) Amendment Regulations 2025 (S.S.I. 2025/165), reg. 1(2), sch. 18 (with sch. 23)

Footnotes

f1

(1)

The value does not apply in the case of plants firing exclusively woody solid biomass.

f2

(2)

300 mg/Nm³ in the case of plants firing straw.

f3

(3)

400 mg/Nm³ in the case of low calorific gases from coke ovens in the iron and steel industry.

f4

(1)

The value does not apply in the case of plants firing exclusively woody solid biomass.

f5

(2)

300 mg/Nm³ in the case of plants firing straw.

f6

(3)

1,100 mg/Nm³ in the case of plants with a rated thermal input greater than 5 MW and less than or equal to 20 MW.

f7

(4)

Until 1 January 2030, 850 mg/Nm³in the case of plants with a rated thermal input greater than 5 MW and less than or equal to 20 MW firing heavy fuel oil.

f8

(5)

400 mg/Nm³ in the case of low calorific gases from coke ovens, and 200 mg/Nm³ in the case of low calorific gases from blast furnaces, in the iron and steel industry.

f9

(6)

170 mg/Nm³ in the case of biogas.

f10

(7)

50 mg/Nm³ in the case of plants with a rated thermal input greater than 5 MW and less than or equal to 20 MW.

f11

(1)

60 mg/Nm³ in the case of biogas.

f12

(2)

130 mg/Nm³ in the case of low calorific gases from coke ovens, and 65 mg/Nm³ in the case of low calorific gases from blast furnaces, in the iron and steel industry.

f13

(3)

1,850 mg/Nm³in the following cases—

f14

(4)

250 mg/Nm³ in the case of engines with a rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.

f15

(5)

250 mg/Nm³ in the case of engines with a rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW,

f16

(6)

380 mg/Nm³ for dual fuel engines in gas mode.

f17

(7)

Emission limit values are only applicable above 70 % load.

f18

(8)

20 mg/Nm³ in the case of plants with a rated thermal input equal to or greater than 1 MW and less than or equal to 20 MW.

f19

(1)

The value does not apply in the case of plants firing exclusively woody solid biomass.

f20

(2)

Until 1 January 2025, 1700 mg/Nm³ in the case of plants which are part of SIS or MIS.

f21

(3)

400 mg/Nm³ in the case of low calorific gases from coke ovens, and 200 mg/Nm³ in the case of low calorific gases from blast furnaces, in the iron and steel industry.

f22

(4)

100 mg/Nm³ in the case of biogas.

f23

(5)

500 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.

f24

(6)

Until 1 January 2025, 450 mg/Nm³ when firing heavy fuel oil containing between 0.2 % and 0.3 % N and 360 mg/Nm³ when firing heavy fuel oil containing less than 0.2 % N in the case of plants which are part of SIS or MIS.

f25

(7)

50 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW; 30 mg/Nm³ in the case of plants with a total rated thermal input greater than 5 MW and less than or equal to 20 MW.

f26

(8)

50 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.

f27

(1)

Until 1 January 2025, 590 mg/Nm³for diesel engines which are part of SIS or MIS.

f28

(2)

40 mg/Nm³ in the case of biogas.

f29

(3)

Engines running between 500 and 1,500 hours per year may be exempted from compliance with those emission limit values if they are applying primary measures to limit NOx emissions and meet the emission limit values set out in footnote (4).

f30

(4)

Until 1 January 2025 in SIS and MIS, 1,850 mg/Nm³ for dual fuel engines in liquid mode and 380 mg/Nm³ in gas mode; 1,300 mg/Nm³ for diesel engines with ≤ 1200 rpm with a total rated thermal input less than or equal to 20 MW and 1,850 mg/Nm³ for diesel engines with a total rated thermal input greater than 20 MW; 750 mg/Nm³ for diesel engines with > 1,200 rpm.

f31

(5)

225 mg/Nm³ for dual fuel engines in liquid mode.

f32

(6)

225 mg/Nm³ for diesel engines with a total rated thermal input less than or equal to 20 MW with ≤ 1,200 rpm.

f33

(7)

190 mg/Nm³ for dual fuel engines in gas mode.

f34

(8)

These emission limit values are only applicable above 70 % load.

f35

(9)

Until 1 January 2025, 550 mg/Nm³for plants which are part of SIS or MIS.

f36

(10)

Until 1 January 2025, 75 mg/Nm³ for diesel engines which are part of SIS or MIS.

f37

(11)

20 mg/Nm³ in the case of plants with a total rated thermal input equal to or greater than 1 MW and less than or equal to 5 MW.