Emissions refer to the release of substances, often gases, into the atmosphere. These substances can come from various sources, including vehicles, factories, and power plants. Common emissions include carbon dioxide, methane, and nitrous oxide, which can contribute to air pollution and climate change. Reducing emissions is important for improving air quality and protecting the environment. Many countries are implementing regulations and promoting cleaner technologies to decrease emissions from fossil fuels and other sources. Efforts such as using renewable energy and enhancing energy efficiency play a crucial role in this process.