emission standard
legal requirements governing air pollutants released into the atmosphere; set quantitative limits on the permissible amount of specific air pollutants that may be released from specific sources over specific timeframes
zero emission
engine, motor, process, or other energy source, that emits no waste products that pollutes the environment or disrupts the climate
European emission standards
technical standard
Bharat Stage emission standards
Indian emission norms based on European standards
United States emission standards
Vehicle emission regulations