Urban Development in Australia 14 indicators covering urban development for Australia. IndicatorLatest Year10-yr change Rank Population in the largest city 22.3% 2025 up 1.3% 107th Population density 3.47 people per sq. km of land area 2023 up 15.1% 214th PM2.5 air pollution, mean annual exposure 6.41 micrograms per cubic meter 2023 up 7.5% 181st Population in urban agglomerations of more than 1 million 16.77 million 2025 up 16.7% 25th Population in urban agglomerations of more than 1 million, per capita 0.6073 units per person 2025 up 0.7% 7th Population in urban agglomerations of more than 1 million, annual 1.28 % change on previous year 2025 down 33.6% 71st Population in urban agglomerations of more than 1 million, per unit 0 units per US$ of GDP 2025 down 11.9% 99th Population in urban agglomerations of more than 1 million, per square 2.13 units per square kilometre 2023 up 18.1% 112th Population in largest city 5.39 million 2025 up 18.7% 41st Crude steelmaking capacity 5.43 Tonnes 2025 unchanged 32nd Africa's Development Dynamics (AfDD) Table 23 - Ecological 931 Hectares 2020 up 7.9% 16th PM2.5 air pollution, population exposed to levels exceeding WHO 24.9% 2017 down 25.7% 179th Adjusted rural to urban parity index for achieving a minimum 0.7904 2018 down 13.7% 25th Transport equipment indicators — Available seat capacity for schedule 1,036 Per 1 000 inhabitants 2016 up 38.9% 22nd