Urban Development in Saudi Arabia 12 indicators covering urban development for Saudi Arabia. IndicatorLatest Year10-yr change Rank Population in the largest city 25.4% 2025 up 1.1% 95th Population density 15.68 people per sq. km of land area 2023 up 22.0% 197th PM2.5 air pollution, mean annual exposure 73.52 micrograms per cubic meter 2023 up 0.7% 2nd Population in urban agglomerations of more than 1 million 18.19 million 2025 up 26.1% 23rd Population in urban agglomerations of more than 1 million, per capita 0.4921 units per person 2025 up 1.7% 13th Population in urban agglomerations of more than 1 million, annual 1.64 % change on previous year 2025 down 51.3% 57th Population in urban agglomerations of more than 1 million, per unit 0 units per US$ of GDP 2025 down 31.5% 87th Population in urban agglomerations of more than 1 million, per square 8.19 units per square kilometre 2023 up 30.3% 90th Population in largest city 7.95 million 2025 up 27.9% 29th Crude steelmaking capacity 11.6 Tonnes 2025 up 0.9% 17th Africa's Development Dynamics (AfDD) Table 23 - Ecological 324.37 Hectares 2020 up 41.1% 27th PM2.5 air pollution, population exposed to levels exceeding WHO 100.0% 2017 unchanged 1st