| Summary: | The paper deals with the problem of rail noise pollution in cities in the context of legal amendments. This aspect is often neglected in the process of spatial planning. The authors were motivated to undertake this analysis both by legal changes permitting higher levels of acceptable noise thresholds, which were introduced and legalised in October 2012, and by the intensified levels of investment in areas neighbouring railways. On selected examples of residential areas in Warsaw, Poland (the city districts of Ursus, Białołęka and Ursynów), relevant land development sites were analysed against the course of isophones showing permissible noise levels. The analysis was based on data taken from acoustic maps for Warsaw from 2012 and 2017, planning studies, the Topographic Objects Database (BDOT10k) and the current state of land development. Using ArcGis software, 22 features, three study areas, and corresponding quantitative indicators were assessed. The authors presented the level of railway noise pollution set against the general spatial development. The analysis demonstrated that the changes in legislation have resulted in the “acoustic release” of land near railways; i.e., in these areas new, less-restrictive regulations on noise pollution have become permissible. In turn, the number of buildings that were considered at risk of noise pollution before 2012 has fallen.
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