Sunlight,the production of oxides of nitrogen,and the production of volatile organic compounds must be present to develop ______________________________.

Oxides of Nitrogen

Chemical compounds made of nitrogen and oxygen that are significant air pollutants, contributing to smog and acid rain.

Volatile Organic Compounds

Organic chemicals that easily vaporize at room temperature, can be sources of air pollution, and are often found in paints, cleaning supplies, and building materials.

Sunlight

The natural light emitted by the Sun, essential for photosynthesis in plants and influencing Earth's climate and weather.