Emission is the discharge of engine exhaust gases. Diesel engines emit more exhaust gases than gasoline engines. The regulations in Europe is specified by the 97/68/EG standard. We generally use soot filters or other alternative technologies like diesel oxidation catalysts or exhaust gas recirculation to keep the emission as low as possible.
There are different categories of allowable emissions in non-road diesel engines. In Europe, we talk about stages I, II, IIIA, IIIB and IV. Every stage determines the amounts of the 4 following pollutants that are permitted, based on the number of grams per kilowatt-hour of the compounds present in diesel exhaust.
  1. NOx Nitrogen Oxides: NOx is a combustion by-product that combines in the atmosphere to create ozone, acid rain and smog.
  2. HC Hydrocarbons: Essentially unburned fuel, HC contributes to ozone and smog production. HC is a minor constituent in diesel exhaust.
  3. CO Carbon Monoxide: CO is also a minor constituent of diesel exhaust. It is controlled by improving combustion efficiency.
  4. Particulates: Particulates are made up of soot particles in diesel exhaust from unburned carbon. Particulate matter is controlled by optimizing the combustion temperature and improving combustion efficiency.
Generating sets with diesel engine from 18 to 560kVA are required to meet stage IIIA requirements, with the exception of generators for fixed installations and emergency generators (Stage II) within the European Union.
 
http://en.wikipedia.org/wiki/Emission_standard

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