The chemical formula of ozone is O3. This molecule consists of three oxygen atoms bonded together and plays a crucial role in the atmosphere. Ozone is found primarily in the stratosphere, where it forms the ozone layer, protecting the Earth from harmful ultraviolet (UV) radiation from the sun. However, at ground level, ozone can be a harmful pollutant, contributing to respiratory issues and other health problems. Understanding ozone's dual role is essential for environmental health.