Nitrogen oxide is released when hydrocarbons combine with water plants make food through photosynthesis special bacteria break down nitrogen fuels are burned at high temperatures

Nitrogen fuels are burned at high temperatures

Explanation:

When the nitrogen-based fuel is burned at high temperatures, the nitrogen in the fuel combines with oxygen to form nitrogen oxide. While this can occur n combustion engines in cars, leading to pollution, the same occurs naturally espically during lightning strikes that cause the nitrogen gas in the atmosphere combine with oxygen. NO is an airway irritant.

3. Photosynthesis

Explanation:

This is mostly produced by trees, and other plants who clean the air.