Urban Development in Iran 12 indicators covering urban development for Iran. IndicatorLatest Year10-yr change Rank Population in the largest city 13.6% 2025 down 3.6% 138th Population density 55.85 people per sq. km of land area 2023 up 13.1% 149th PM2.5 air pollution, mean annual exposure 40.25 micrograms per cubic meter 2023 up 1.1% 23rd Population in urban agglomerations of more than 1 million 23.31 million 2025 up 14.2% 18th Population in urban agglomerations of more than 1 million, per capita 0.2522 units per person 2025 up 2.1% 48th Population in urban agglomerations of more than 1 million, annual 1.2 % change on previous year 2025 down 11.0% 74th Population in urban agglomerations of more than 1 million, per unit 0.0001 units per US$ of GDP 2025 up 28.8% 38th Population in urban agglomerations of more than 1 million, per square 14.02 units per square kilometre 2023 up 14.9% 68th Population in largest city 9.73 million 2025 up 13.7% 25th Crude steelmaking capacity 60 Tonnes 2025 up 71.5% 5th Africa's Development Dynamics (AfDD) Table 23 - Ecological 518.25 Hectares 2020 up 51.0% 22nd PM2.5 air pollution, population exposed to levels exceeding WHO 100.0% 2017 unchanged 1st