Practicing Outdoor Physical Activity: Is It Really a Good Choice? Short- and Long-Term Health Effects of Exercising in a Polluted Environment

Background: Air pollution is an environmental risk factor for mortality and the fifth largest risk factor for all causes of death. The practice of regular physical activity is strongly encouraged to achieve a healthy lifestyle. During a physical exercise session, the volume of inhaled pollutants increases. The present study aims to report the evidence about the interaction between polluted air, physical activity, and the interactive effects of these two variables on individuals’ health in the light of the significant changes occurring in the daily routine of individuals practicing sport and physical activities after the end of the pandemic. Methods: A mapping review was performed on electronic databases to summarize studies reporting the effects of pollutants on specific health outcomes. A further analysis investigated how physical habits and air quality changed following the COVID-19 pandemic. Results: The current literature suggests that air pollution alters both short- and long-term health outcomes. Nonetheless, exercising is a protective factor against the harmful effects of air pollution. Conclusions: It is necessary for those who train outdoors to evaluate the external environmental conditions. The change should be aimed at improving air quality by implementing stricter legislative guidelines on air pollution thresholds.