Emission levels refer to the amount of pollutants released into the atmosphere from various sources, such as vehicles, factories, and power plants. These pollutants can include greenhouse gases like carbon dioxide and methane, which contribute to climate change, as well as other harmful substances that can affect air quality and public health. Monitoring emission levels is crucial for understanding environmental impact and developing strategies to reduce pollution. Governments and organizations often set regulations and targets to lower these levels, aiming to protect the environment and promote sustainable practices. Tools like emission inventories help track and manage these pollutants effectively.