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Background Inland Waterway Transport (IWT) causes considerable emissions of the air pollutants NOx and PM10. Many European regions are struggling to tackle air quality problems, though the often expensive measures implemented to meet air quality limit values are mainly directed at industry and road transport. However, it is increasingly recognised that in ...

...s such as dams and weirs. Significant efforts had already been made to improve the Rhine for migrating fish. Environmental legislation had served to alleviate pollution and a North-Rhine Westphalia (NRW) migratory fish programme had focused on overcoming river barriers, for example by constructing fish ladders across weirs. This had shown improved access to spawning grounds for migratory fish suc ...