Urban Development in Mauritania 11 indicators covering urban development for Mauritania. IndicatorLatest Year10-yr change Rank Population in the largest city 49.4% 2025 down 4.4% 20th Population density 4.87 people per sq. km of land area 2023 up 34.5% 206th PM2.5 air pollution, mean annual exposure 46.5 micrograms per cubic meter 2023 up 8.7% 16th Population in urban agglomerations of more than 1 million 1.61 million 2025 up 52.5% 103rd Population in urban agglomerations of more than 1 million, per capita 0.3035 units per person 2025 up 13.8% 37th Population in urban agglomerations of more than 1 million, annual 3.92 % change on previous year 2025 down 12.0% 15th Population in urban agglomerations of more than 1 million, per unit 0.0001 units per US$ of GDP 2025 down 19.3% 13th Population in urban agglomerations of more than 1 million, per square 1.45 units per square kilometre 2023 up 53.9% 115th Population in largest city 1.61 million 2025 up 52.5% 102nd PM2.5 air pollution, population exposed to levels exceeding WHO 100.0% 2017 unchanged 1st Dollar value of all resources made available to strengthen 9.24 million 2023 up 554.9% 30th