Boosted immune function
Expert guidance suggests that being outside reduces your chances of getting the COVID-19 (SARS-CoV-2) virus as well as other viruses. This is so that the presence of viruses in the air can be dispersed by air movement. In fact, according to data from 2021, interiors have 18.7 times the risk of transmission than outside areas.
Furthermore, being outside can still boost your immune system function. In fact, more sunlight leads to better vitamin D production, which benefits your immune system already. Outside seems to be beneficial in other ways. Numerous plants release molecules into the air, including organic substances known as phytoncides, that appear to improve immune function. Additionally, it appears that sunlight stimulates T cells, immune system-specific cells that help in the battle against infection.