Disclosed are a method of evaluating risk impacts in a pedestrian environment due to the diffusion of a hazardous substance in an urban area and an apparatus therefor. The method comprises: a first step of receiving at least one GIS data including terrain boundary data and terrain data for a target area and constructing a three-dimensional detailed topography; a second step of designing a scenario through statistical analysis of automatic meteorological network data reflecting weather characteristics for a certain period at a specific observation point in the target area; a third step of calculating the wind field and the diffusion field of the target area according to a scenario; a fourth step of performing verification for ensuring reliability as to whether the index calculated in the third step appears within a valid range; a fifth step of calculating diffusion information of a hazardous substance in the pedestrian environment according to a weather condition; and a sixth step of visualizing the diffusion information of a hazardous substance to display the same on the three-dimensional detailed topography.
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