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UN-Habitat estimates that the main cities of Beirut, Tripoli, Saida, and Tyre host 65 per cent of the Lebanese population, 90 per cent of Palestine refugees and near 30 per cent of displaced Syrians.
Lebanon has been facing since July 2015 a severe solid waste crisis that led to the creation of 1700 informal dumping sites, and to the compilation of garbage in the streets of the cities.
The influx of refugees has augmented Lebanon population density from 400 to 520 person/km2.