Emissions standards are regulations set by governments to limit the amount of pollutants that can be released into the air from various sources, such as vehicles, factories, and power plants. These standards aim to protect public health and the environment by reducing harmful emissions, including carbon dioxide, nitrogen oxides, and particulate matter. Different countries and regions may have their own specific emissions standards, which can vary based on the type of source and the pollutants involved. Compliance with these standards often requires the use of advanced technologies and practices, helping to promote cleaner air and a healthier ecosystem.