Nitrogen Oxides

Nitrogen oxide emission standards have been introduced or are becoming more stringent around the world due to increased concerns about the local, regional, and transboundary effects of NOx emissions. Generally, international legislation has been an important factor in developing national regulations in many parts of the world. Recognition of the transboundary effect of air pollution has led to a number of international agreements [50]. Those that pertain to NOz emissions include the UNECE LRTAP (discussed in the previous section), EC directives, and World Bank environmental guidelines. In addition to the SO2 emissions discussed earlier, the UNECE

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