Emission regulations are rules set by governments to control the amount of pollutants released into the air by vehicles, factories, and other sources. These regulations aim to reduce harmful emissions, such as carbon dioxide and nitrogen oxides, which can contribute to climate change and air quality issues. To enforce these regulations, authorities often require emissions testing and set limits on the amount of pollutants that can be emitted. Compliance with these rules helps protect public health and the environment, encouraging the development of cleaner technologies and promoting sustainable practices in industries like automotive and energy.