Following motor car combustion engines, more and more significance is being attached to thepollutants emissions from the engines other than used in motor cars. The scale and variety of applications of such engines are considerable. At present these engines are less modern than those from motor cars, and requirements posed for them are not as restrictive with regards environmental protection, as in the case of motorism. This paper analyzes assessment procedures for the pollutant emissions from the combustion engines of other applications than in motor cars. Influence of the engine operating conditions on the pollutants emission has been evaluated.