This study was conducted to emphasize the correlation between the number of physical education lessons with effects on the formation of high school students and the importance of practicing physical activities during the extra-class time in sustainable spaces with quality breathable air. The values were recorded in this cross-sectional study; on a number of 208 high school students; grades 9–12; tested for the level of manifesting their effort capacity acquired during the physical education lessons. The statistical analysis of the processed data highlights the obtained values: Weak 59% and 31% satisfactory for boys; and 53.92% weak; 34% satisfactory for girls. In conclusion; the necessity to carry out extra-curricular physical activities in an unpolluted environment and to acquire useful physical skills in carrying out different activities in society, promotes and generates sustainability in maintaining the lifestyle.

High development of urban areas, cohabitation of a large number of populations, as well as industrial enterprise development, reduce the quality of environmental factors. Air quality data in Bucharest was analyzed to establish the evolution of nitrogen oxide concentration for a period of 24 hours during the week and for a longer period of time, i.e. 2006-2007, respectively. For a healthier life, in order to increase the population health degree, in the last time we underline the mentality change as well as training for physical activities of a large number of people. Thus we can observe two main stream mass sports and also the planning of the activities for preparation in the performance sport, in correlation with environmental factor. This paper shows the effects of applying a workout plan in which the evolution of nitric oxides concentrations are taken in account during different hours of the day and different days in the week. Scheduling intensely aerobe physical activities during hours when the nitric oxides concentrations are lower has led to better results in the competition for the athletes participants to the experiment.