Increasing problems on natural environment, pollution of water reserves, and are seen in Hungary as a result of the raising of large-scale livestock activities. Several devices for ammonia concentration evaluation of the air coming from ventilation are available for manual or semi-automatic sampling. The use of appropriate electric sensors leads to direct measures of ammonia concentration and measuring instruments can also be used for follow the variation in time of the concentration emitted. New laws have been adopted in Hungary to protect the purity of air and limit the emissions depending on the geographical location and the current load in this area. The emissions limits for ammonia vary from 1 to 1,5 kg/h and fine (equivalent to $0-50 US per ton of pollutant) are imposed for units that exceed this emission limit.
The publication is more oriented toward cattle and broiler production. However the ammonia emission level considered in the regulation is common to all livestock production. The level of ammonia emissions from a livestock building of 1 – 1,5 kg / h can be brought down to an ammonia concentration of mg/m3 and return than to the ventilation rate in m3/h. No links are make to a number of animals which make an analysis difficult.