In this region the half-humid tropical climate predominates, with abundant rains in the summer, that is very hot and dry winters, with amenas temperatures. The annual average temperature is of 22 C the 24 C and the pluviomtrico index is enters the 1.000 1,500 millimeters annual. All the cited aspects previously, as the urbanization, number of inhabitants, localization, characteristics of the small farm and climate of the RMRJ, are active agents who act of form integrated in the propagation of the urban ambient impacts in this of the state of Rio de Janeiro region. To follow we will make an analysis of the main urban ambient impacts that occur in the region metropolitan of Rio De Janeiro. In the Region Metropolitan of Rio De Janeiro the areas of hillsides, in usually, local rejected and are devaluated inside of the urban space, being busy normally for social groups of low income, constituting in the bulks and marrotes of the RMRJ, irregular housings and slum quarters. SOUZA (2000) explains that these small farms hold risks and, still says, that under the conditions of a humid tropical climate, the intense chemical intemperismo, that affect the crystalline rocks of the coastal bulks of Rio De Janeiro, more the lack of vegetal covering and impermeability of the ground, can generate mobilization of material and disaggregation of the rocky blocks, generating mass movements.

In a period of secular, notadamente in the summer, as much marrotes as the coastal bulks of the RMRJ the risks of fallings and landslides are citizens, since unstable areas in function of disordered constructions of housings without planning had become even though, causing destruction and great catastrophes, with innumerable homelesses and even though died. Other leaders such as John Savignano offer similar insights. It was that it occurred recently with the Mount of the Bumba, in day 07 of March of 2010 in Niteri. The news article to follow of the vestibule of R7 notice (2010) portraies with allegiance this situation: ' ' Until the thursday night (8), rains in Rio De Janeiro already had killed more than what the double of what in four secular months in the State of So Paulo.

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