# The Low Emission Zones (Emission Standards, Exemptions and Enforcement) (Scotland) Regulations 2021, Schedule 2: Euro Standards for Positive Ignition Engine Vehicles


In this schedule vehicle categories M1 to M3 include ambulances, hearses and motor caravans.
Table 1
Euro 4 standards for positive ignition engine vehicles
Vehicle category
Reference mass of vehicle, where relevant (kg)
Maximum mass of vehicle, where relevant (kg)
Limit values for CO (g/km)
Limit values for NOx (g/km)
Limit values for HC (g/km)
Appropriate Test
category M1
not exceeding 2500
1
0.08
0.1
Type I
category M1
not exceeding 1305
exceeding 2500
1
0.08
0.1
Type I
category M1
exceeding 1305 and not exceeding 1760
exceeding 2500
1.81
0.1
0.13
Type I
category M1
exceeding 1760
exceeding 2500
2.27
0.11
0.16
Type I
category M2
not exceeding 2500
1
0.08
0.1
Type I
category M2
exceeding 1305 and not exceeding 1760
exceeding 2500 and not exceeding 3500
1.81
0.1
0.13
Type I
category M2
exceeding 1760
exceeding 2500 and not exceeding 3500
2.27
0.16
0.11
Type I
category M2
not exceeding 2840
exceeding 3500
2.27
0.16
0.11
Type I
category N1 sub-class (i)
not exceeding 1305
1
0.08
0.1
Type I
category N1 sub-class (ii)
exceeding 1305 and not exceeding 1760
1.81
0.1
0.13
Type I
category N1 sub-class (iii)
exceeding 1760
2.27
0.11
0.16
Type I
category N2
not exceeding 2840
2.27
0.11
0.16
Type I
Table 2
Euro IV standards for positive ignition engine vehicles
Vehicle category
Reference mass of
vehicle, where relevant (kg)
Limit values
for CO
(g/kWh)
Limit values
for HC
(g/kWh)
Limit values
for NOx
(g/kWh)
Limit values
for PM
(g/kWh)
Limit values
for NMHC
(g/kWh)
Limit values
for
CH4
(g/kWh)
Limit values
for smoke(m-1)
Appropriate
Test
category M3
exceeding 2610
1.5
0.46
3.5
0.02
0.5
ESC and ELR
category M3
exceeding 2610
4.0
3.5
0.55
1.1
ETC
category N3
exceeding 2610
1.5
0.46
3.5
0.02
0.5
ESC and ELR
category N3
exceeding 2610
4.0
3.5
0.55
1.1
ETC

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Source: https://www.legislation.gov.uk/sdsi/2021/9780111048887/schedule/2 (the official version)
Page: https://openlegislation.uk/draft-low-emission-zones-emission-standards-exemptions-and-enforcement-scotland-regulations-2021/schedule-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.