Emission standards for mobile nonroad engines were adopted in 2007 [2880]. The requirements, outlined below, are based on the European Stage I/II emission standards for mobile nonroad engines. However, the Chinese regulation also covers small diesel engines, which were not subject to the European standards. Emission limits for the smallest engines are consistent with the US Tier 1/2 nonroad standards.

The compliance dates are:

  • Stage I standards: 2007.10
  • Stage II standards: 2009.10
Table 1
Emission Standards for Nonroad Diesel Engines, g/kWh
Max Power (P), kWCOHCNOxHC+NOxPM
Stage I†
130 ≤ P ≤ 5605.01.39.2-0.54
75 ≤ P < 1305.01.39.2-0.7
37 ≤ P < 756.51.39.2-0.85
18 ≤ P < 378.42.110.8-1.0
8 ≤ P < 188.4--12.9-
0 < P < 812.3--18.4-
Stage II
130 ≤ P ≤ 5603.51.06.0-0.2
75 ≤ P < 1305.01.06.0-0.3
37 ≤ P < 755.01.37.0-0.4
18 ≤ P < 375.51.58.0-0.8
8 ≤ P < 186.6--9.50.8
0 < P < 88.0--10.51.0
† Stage I limits shall be achieved before any exhaust aftertreatment device.

Emissions are measured over a steady-state test cycle that is equivalent to the ISO 8178 C1, 8-mode test. Other ISO 8178 test cycles can be used for selected applications.