Regulatory Background

China adopts emission standards for mobile nonroad engines that are based on European regulations. Some of the important regulatory steps include:

  • Stage I/II standards: First emission standards for mobile nonroad engines were adopted in 2007 [2880]. The requirements were based on the European Stage I/II nonroad emission standards. However, the Chinese regulation also covered small diesel engines, which were not subject to the European standards. Emission limits for the smallest engines were consistent with US Tier 1/2 nonroad standards.
  • Stage III/IV standards: In May 2014, the MEP adopted regulations specifying China Stage III/IV emission standards [3053] that are based on the EU Stage IIIA and EU Stage IIIB/IV requirements, respectively. The Stage III standards are to be effective from 2014.10 for new types and from 2015.10 for all engines. The effective dates for Stage IV standards have not yet been set.

Stage I/II Emission Standards

The compliance dates for Stage I/II standards, Table 1, were:

  • 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.