O₃

O₃, commonly known as ozone, is a triatomic molecule composed of three oxygen atoms. It is primarily found in the Earth’s stratosphere, where it forms the ozone layer, which protects living organisms from harmful ultraviolet (UV) radiation. Ozone can also exist at ground level as a pollutant produced by chemical reactions between volatile organic compounds and nitrogen oxides in the presence of sunlight. Ozone has a characteristic sharp smell and plays a crucial role in both the atmosphere and environmental health.

O₃ meaning with examples

• In the stratosphere, O₃ absorbs the majority of the sun's ultraviolet radiation, significantly reducing the amount of UV that reaches the Earth's surface, thus protecting all forms of life from damage.
• While O₃ is beneficial in the stratosphere, at ground level it can become a pollutant, contributing to respiratory issues and other health problems, especially in urban areas during summer.
• Scientists monitor O₃ levels closely since fluctuations in the ozone layer can indicate changes in atmospheric conditions, potentially signaling climate change or the presence of pollutants.
• Regulations on emissions of nitrogen oxides and volatile organic compounds directly affect the concentration of O₃, making air quality and environmental policies crucial for public health.
• During a thunderstorm, the distinctive smell of O₃ is often noticed, which arises from the lightning's ability to break apart oxygen molecules, allowing them to recombine into the ozone form.