# The Low Emission Zones (Emission Standards, Exemptions and Enforcement) (Scotland) Regulations 2021, Schedule 1: Euro Standards for Compression Ignition Engine Vehicles


In this schedule vehicle categories M1 to M3 include ambulances, hearses and motor caravans.
Table 1
Euro 6 standards for compression ignition engine vehicles
Vehicle category
Reference mass of vehicle, where relevant (kg)
Limit values for CO
(mg/km)
Limit values for NOx
(mg/km)
Limit values for THC+
NOx (mg/km)
Limit values for PM
Limit values for PN (#/km)
Appropriate Test
category M1
not exceeding 2610
500
80
170
4.5
6 x 10
Type I
category M2
not exceeding 2610
500
80
170
4.5
6 x 10
Type I
category N1 sub-class (i)
not exceeding 1305
500
80
170
4.5
6 x 10
Type I
category N1 sub-class (ii)
exceeding 1305 and not exceeding 1760
630
105
195
4.5
6 x 10
Type I
category N1 sub-class (iii)
exceeding 1760
740
125
215
4.5
6 x 10
Type I
category N2
not exceeding 2610
740
125
215
4.5
6 x 10
Type I
Table 2
Euro VI standards for compression ignition engine vehicles
Vehicle category
Reference mass of vehicle, where relevant (kg)
Limit values for CO
(mg/kWh)
Limit values for NOx
(mg/kWh)
Limit values for NH3
(ppm)
Limit values for PM
(mg/kWh)
ParticleMass Number(#kWh)
Appropriate Test
category M1
exceeding 2610
1500
400
10
10
6 x 10
WHSC
category M1
exceeding 2610
4000
460
10
10
6 x 10
WHTC
category M2
exceeding 2610
1500
400
10
10
6 x 10
WHSC
category M2
exceeding 2610
4000
460
10
10
6 x 10
WHTC
category M3
exceeding 2610
1500
400
10
10
6 x 10
WHSC
category M3
exceeding 2610
4000
460
10
10
6 x 10
WHTC
category N2
exceeding 2610
1500
400
10
10
6 x 10
WHSC
category N2
exceeding 2610
4000
460
10
10
6 x 10
WHTC
category N3
exceeding 2610
1500
400
10
10
6 x 10
WHSC
category N3
exceeding 2610
4000
460
10
10
6 x 10
WHTC

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Source: https://www.legislation.gov.uk/sdsi/2021/9780111048887/schedule/1 (the official version)
Page: https://openlegislation.uk/draft-low-emission-zones-emission-standards-exemptions-and-enforcement-scotland-regulations-2021/schedule-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.