Outdoor vaccination refers to the practice of administering vaccines in outdoor settings, such as parking lots, sports stadiums, or open-air clinics, rather than traditional indoor healthcare facilities. This approach allows for larger numbers of people to be vaccinated quickly and efficiently, particularly during large-scale vaccination campaigns or in areas with limited healthcare infrastructure. Outdoor vaccination can help improve accessibility and reduce barriers to vaccination, reaching underserved populations and increasing overall vaccine coverage rates. This approach has been particularly relevant during the COVID-19 pandemic, where outdoor vaccination sites have played a crucial role in mass vaccination efforts worldwide.