Compared to Stage IIIA, Stage IIIB demands a reduction of particulate matter (PM) by 90% and a reduction of nitrogen oxides (NOx) by 50%. On top of that, Stage IV demands a reduction of nitrogen oxides (NOx) by 80% and almost doesn’t allow particulate matter (PM) at all. For generating sets, Stages IIIB and IV are not applicable.
 
Tier 3, 4i and 4f are the American emission standards equivalent to the European Stages IIIA, IIIB and IV.
 
European emission standards
Stage II
Useful output P (kW) 18-<37 37-<75 75-<130 130-<560
Carbon dioxide CO2 (g/kWh) 5.50 5.00 5.00 3.50
Nitrogen oxides NOx (g/kWh) 8.00 7.00 6.00 6.00
Particulate matter (PM) (g/kWh) 0.60 0.40 0.30 0.20
Valid from 01-2001 01-2004 01-2003 01-2002
European standard 97/68/EC

Stage IIIA
Useful output P (kW) 19-<37 37-<75 75-<130 130-<560
Carbon dioxide CO2 (g/kWh) 5.50 5.00 5.00 3.50
Hydrocarbons HC+        
Nitrogen oxides NOx (g/kWh) 7.50 4.70 4.00 4.00
Particulate matter (PM) (g/kWh) 0.60 0.40 0.30 0.20
Valid from 01-2007 01-2008 01-2007 01-2006
European standard 2004/26/EC

Stage IIIB
Useful output P (kW) 37-<56 56-<75 75-<130 130-<560
Carbon dioxide CO2 (g/kWh) 5.00 5.00 5.00 3.50
Hydrocarbons HC+        
Nitrogen oxides NOx (g/kWh) 4.70 3.30 3.30 2.00
Particulate matter (PM) (g/kWh) 0.025 0.025 0.025 0.025
Valid from 01-2013 01-2012 01-2012 01-2011
European standard 2004/26/EC

Stage IV
Useful output P (kW) 56-<130 130-<560
Carbon dioxide CO2 (g/kWh) 5.00 3.50
Hydrocarbons HC(g/kWh) 0.19 0.19
Nitrogen oxides NOx (g/kWh) 0.40 0.40
Particulate matter (PM) (g/kWh) 0.025 0.025
Valid from 10-2014 01-2014
European standard 2004/26/EC

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