Non-metal oxides are compounds formed when non-metal elements react with oxygen. Common examples include carbon dioxide (CO₂), sulfur dioxide (SO₂), and nitrogen oxides (NOx). These oxides typically have low melting and boiling points and can exist as gases or liquids at room temperature. These compounds often play significant roles in environmental chemistry. For instance, carbon dioxide is a greenhouse gas that contributes to climate change, while sulfur dioxide can lead to acid rain. Understanding non-metal oxides is essential for studying air quality and their impact on ecosystems.