## 4 Discussion  
As a result of our work, a freely usable, scientifically and practically based, integrated technology assessment tool with an N-management approach was developed in Hungarian. The results of the model, based on real data, can be used to evaluate ammonia emission reduction measures at the farm level and, in addition, can be used to promote the adoption of emission abatement technologies and practices at the farm level through the information provided in supporting documents. AGEM-S can thus be used as a knowledge transfer tool and as a decision support tool for technological changes. Dissemination has been emphasized as the most important factor influencing the publicity of the development. As part of this, the theoretical and the practical operation of the system were presented at events for pig farmers and trainers of future agricultural specialists, with the support of the Hungarian Pig Breeding Association. In addition, the AGEM-S also appeared in agricultural magazines and on agricultural TV programs. The users of the developed model are almost exclusively from large-scale pig farms subject to Hungarian laws. The BAT conclusions [68] also set limit values for N excreted and ammonia emission levels from livestock buildings, and the pig farms had to demonstrate that their emissions were below the limit values. Since more than 70% of the Hungarian swine stock is kept on intensive rearing farms [69], this affected a significant number of pig farmers. Although AGEM-S was not designed to meet the needs of the BAT conclusions, there was a high level of interest from those who are involved in the environmental licensing of pig farms. However, medium and small/household farms still do not use the system. This lack of interest may be due to the low level of environmental awareness of farmers, mainly due to their financial success orientation and administrative burden. Scoto's [70] survey of Hungarian smallholders, which found that farmers can be divided into three types in terms of information technology use: \"information accumulators\", \"analytically-minded\", and \"isolated\", may also provide some explanation. The integration of new agricultural innovations into their farm management is only typical of the second group, which is mostly made up of farmers with higher education. Similar experiences of implementing measures to reduce ammonia emissions and raise farmers' interest were reported in Poland [71]. Currently, while maintaining the weight and output volume of the livestock sector, the solution to reduce the environmental impact of animal production is to use science-based, practice-oriented emission abatement techniques/technologies that shift production processes towards sustainability. Each emission reduction measure introduced has some significance in terms of its contribution to local, national, and global load reduction. This is highlighted by AGEM-S through pig farming processes. [PERSON] et al. [72] classified the factors that contribute to the adoption of a tool into three categories: institutional embeddedness, sense of ownership, and tool functions. Institutional embeddedness and tool functions are well defined for our research/development. Although we kept the interests of pig farmers in mind during the development process, with the active involvement of MSTSZ, and we learned from each other and provided coaching on appropriate tool use, a sense of ownership was clearly not achieved. Furthermore, more attention should have been paid to the specificity of large-scale pig farms as stakeholders; their air pollution data, such as ammonia emissions, are not provided by the owners themselves or by the agromomists employed on the farm, but by contracted companies with an environmental profile to carry out these farm surveys on their behalf. As environmental considerations are therefore partly outsourced from the farm, this undermines a better understanding of the issue and the effectiveness of the decision support function.