Sustainable development involves economic growth in line with the requirements of ecological balance and human development, involving people’s relations with the environment as well as the responsibility of the current generation over future generations. Sustainable tourism was designed and supported in an attempt to manage all resources, so that the economic, social, and aesthetic needs of an area are satisfied while maintaining cultural integrity, essential ecological processes, biological diversity, and life support systems. Sustainable tourism is not “a fashion”; it is a way of thinking and acting with long-term implications. At national level, we believe that Maramureş County, Romania, is one of the most gifted natural and socio-economic geographic areas in the Oriental Carpathians of Romania, in which the conditions of sustainable tourism can be met and supported long term. The purpose of this scientific paper is to identify, synthesize, process, and interpret data about the tourist qualification of some localities in the protected areas of Maramureş, so as to inform local decision-makers and tourists about tourism forms currently practiced (and) possibly practicable in the future, because since tourism, as an economic branch, leads to the growth of jobs, it can contribute to the sustainable development of the area. The mathematical model proposed in the paper allows the grouping of available resources from 25 settlements in order to establish the types of tourism that can be supported and developed in these localities.

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The paper aims to analyse the main air pollutants considered responsible for most premature deaths and illnesses: particulate matter, nitrogen dioxide, sulphur dioxide, and ground-level ozone. The research methodology used is based on the analysis and synthesis of information from the scientific literature on air pollution, identification of sources of air pollutants and their implications for human health. The principal research method used in the paper is content analysis. The importance of this publication is to expand and improve the content of the literature in the domain. The contributors point out that air pollution is currently the highest environmental risk affecting human health. Every year, this type of pollution causes around 400,000 premature deaths in the European Union and causes various illnesses: respiratory, strokes and lung diseases, cardiovascular, liver and blood diseases. Emissions of air pollutants are mainly the result of human actions: heating of homes, road transport, the energy sector, industry, agriculture and others in much smaller proportions. The authors' investigation revealed that, in overall terms, air quality has not improved with the reduction of greenhouse gas emissions. In conclusion, the authors highlight the need for environmental policies that contribute to reducing emissions and improving air quality, intending to further safeguard human health and the environment.