By signing the Göteborg protocol in 1999 and by adopting the NEC directive 2001/81/EC of the European Parliament and the Council in 2001, Germany accepted the obligation to adhere to a national limit of 550 kt per year for the emissions of ammonia (NH3) and not to exceed this limit as of the year 2010. According to the current prognosis, however, it is impossible to remain below this emission limit without additional measures for the reduction of ammonia emissions.