The discomfort caused by odors can be solved by products that neutralize odors by chemical reaction.
Odor nuisances are often generated by the ammonia and hydrogen sulfide derivatives, such as amines and mercaptans. Concentrations of these compounds are often very low in the air (the ppm: 1/1 000 000 or ppb: 1/1 000 000 000) and therefore below from the detection limits of the equipment from laboratory. Currently, the only way to measure the intensity of odors is olfactometry test by a panel of odor. The results are in accordance with the European standard EN13725 and are expressed in odor units (OU odor unit).
The odor reduction is achieved by a chemical reaction of oxidation-reduction, this being nonlinear and showing a sharp decline in the level of odor neutralization point. The concentrations of the odors are often unknown and dosage in-situ can reach the abatement of odors at levels of more than 65% but not 100% due to the evolution of the reaction redox (this never reaches 100%).