| Summary: | The present study investigates the frequency with which the fog phenomenon occured in the urban areas of the Romanian Plain, between 1961-2007 through a detailed statistical analysis of its monthly, annually and seasonally levels. The main purpose is to highlight the differentiated exposure of selected cities to the occurence of this type of climatic hazard whose territorial distribution is closely dependent on the presence of evaporation sources in the region and which contributes to its intensification. In this sense, the relative air humidity ≥80% at 1 p.m. was also taken into account, so that the cumulative contribution of the two analzyed climatic parameters showed a high predisposition to the occurence of the fog phenomenon in general and especially in the cold season of the year. Although the evolution trends of the fog phenomenon are generally declining, there is the possibility of occurence of higher values than those registered for all the analyzed urban ecosystems
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