Gas emission refers to the release of gases into the atmosphere, often as a result of human activities such as burning fossil fuels, industrial processes, and agricultural practices. Common gases emitted include carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), which can contribute to air pollution and climate change. These emissions can have significant environmental impacts, including the greenhouse effect, which leads to global warming. Efforts to reduce gas emissions include transitioning to renewable energy sources, improving energy efficiency, and implementing regulations to limit pollutants from vehicles and industries.