Emissions monitoring is the process of measuring and recording the amount of pollutants that are released into the atmosphere from industrial processes or vehicles. It involves the use of sophisticated instruments and equipment to detect and measure the levels of pollutants, such as carbon dioxide, sulfur dioxide, nitrogen oxides, and other volatile organic compounds. The data collected from these instruments can then be used to identify sources of emissions, assess the effectiveness of emission control strategies, and inform local air quality standards and regulations.