In the past Man coinhabited harmoniously with nature only to have the balance disturbed with the advent of the Industrial Revolution replacing the green habitat with urban concrete settlements Consequently, the characteristics of the contemporary city pose a set of serious threat to man’s physical and mental health. Crowdedness, lack of apt infrastructure, pollution, noise pollution and rise in temperature are all contributing factors to the Man’s demised health and detachment from previous amicable coexistence with nature. For the past 30 years, extensive research has been conducted studying the correlation between man and nature, and nature’s impact on man’s health. The theory of “Biophilia,” by Edward, O. Wilson, Rachel and Stephen Kaplan’s “Attention Restorative Theory,” and Roger Ulrich’s “Stress Reduction Theory,” have been innovating and contributing towards gaining more understanding of the importance of a green environment in man’s everyday life. As a corollary the above-mentioned theories gave rise to the following quantitative study conducted over a 4-month period, including 81 respondents, in Spring 2020, focusing on whether a natural green environment in Sweden had impacted the mental and physical health in Greek immigrants to Sweden. The findings suggest that comparing the respondents’ life in Greece and respectively in Sweden there was indeed an improvement in the mood and health of the sample groups taking into consideration: how healthy they are, how healthy they feel, how happy they feel in relation to work, time spent in Sweden, marital status and of course the parameters that focus on the part of the natural environment at home and in their neighbourhood in Sweden. There seem to have been a statistically significant improvement in their health compared to when they lived in Greece but there is insufficient evidence to support that some of the parameters examined are responsible for this. Happiness on the other hand seem to possess a statistical important role due to their marital status among others along with the green surrounding environment having an impact on their mental well-being but not their physical health. Therefore, a more sustainable green environment seems to have impacted the overall psychological and physical state of the respondents, but further extensive research is recommended to investigate in depths others factors i.e., psychosomatics, environmental psychology along with nature related theories and studies.