Relating vehicle emission regulations to air quality

The European regulations governing the emissions of gaseous pollutants from gasoline-engined motor vehicles is reviewed and dis-cussed, including the so-called ’Luxembourg Agreement ’. The relationship between the regulation emission limits and those measured in practice from ‘as-received ’ vehicles in use is also discussed. Having discussed the relationship between regulations and emissions, the further relationships between vehicle emissions and air quality are also discussed, giving particular attention to carbon monoxide, oxides of nitrogen and kad.