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Emission Standards » Japan

Heavy-Duty Engines

Diesel Engines

Emission standards for new diesel engines used in heavy commercial vehicles are summarized in Table 1.

Table 1
Emission standards for diesel engines used in heavy commercial vehicles
GVW > 3500 kg (> 2500 kg before 2005)
DateTestUnitCOHCNOxPM
mean (max)mean (max)mean (max)mean (max)
1988/896 modeppm 790 (980)510 (670)DI: 400 (520)
IDI: 260 (350)
 
199413 modeg/kWh 7.40 (9.20)2.90 (3.80)DI: 6.00 (7.80)
IDI: 5.00 (6.80)
0.70 (0.96)
1997a7.40 (9.20)2.90 (3.80)4.50 (5.80)0.25 (0.49)
2003b2.22 0.87 3.38 0.18
2005cJE05 2.22 0.17d2.0 0.027
2009e 2.22 0.17d0.7 0.01
2016fWHTC 2.22 0.17d0.4 0.01
a - 1997: GVW ≤ 3500 kg; 1998: 3500 < GVW ≤ 12000 kg; 1999: GVW > 12000 kg
b - 2003: GVW ≤ 12000 kg; 2004: GVW > 12000 kg
c - full implementation by the end of 2005
d - non-methane hydrocarbons
e - 2009: GVW > 12000 kg; 2010: GVW ≤ 12000 kg
f - 2016: GVW > 7500 kg; 2017: tractors; 2018: 3500 < GVW ≤ 7500 kg

Gasoline and LPG Engines

Emission standards for new gasoline and LPG fueled engines for heavy commercial vehicles are summarized in Table 2. No new standards for heavy-duty gasoline and LPG engines were published for the post 2018 time frame.

Table 2
Emission standards for gasoline and LPG engines for heavy commercial vehicles, g/kWh
GVW > 3500 kg
DateTestCOHCNOxPM
mean (max)mean (max)mean (max)mean (max)
2009JE05 16.00.23d0.7 0.01a
a - PM values apply only to direct-injection, lean-burn vehicles equipped with absorption-type NOx reduction catalysts.