What are four ingredients that lead to ground level ozone and the symbols?

Ground-level ozone is formed through a chemical reaction between sunlight and pollutants. The four main ingredients that contribute to its formation are volatile organic compounds (VOCs), nitrogen oxides (NOx), sunlight (UV radiation), and heat. The chemical symbols for these ingredients are: VOCs (varies, as they comprise various compounds), NOx (NO for nitrogen monoxide and NO₂ for nitrogen dioxide), and sunlight is represented by UV. Heat is typically not represented by a chemical symbol but is a necessary environmental factor.