Urban Development in Thailand 14 indicators covering urban development for Thailand. IndicatorLatest Year10-yr change Rank Population in the largest city 25.3% 2025 down 10.8% 96th Population density 140.35 people per sq. km of land area 2023 up 2.7% 83rd PM2.5 air pollution, mean annual exposure 23.49 micrograms per cubic meter 2023 down 13.8% 66th Population in urban agglomerations of more than 1 million 15.52 million 2025 up 19.9% 27th Population in urban agglomerations of more than 1 million, per capita 0.2167 units per person 2025 up 18.1% 63rd Population in urban agglomerations of more than 1 million, annual 1.36 % change on previous year 2025 down 44.5% 66th Population in urban agglomerations of more than 1 million, per unit 0 units per US$ of GDP 2025 down 16.6% 68th Population in urban agglomerations of more than 1 million, per square 29.55 units per square kilometre 2023 up 22.4% 32nd Population in largest city 11.39 million 2025 up 21.2% 19th Crude steelmaking capacity 11.36 Tonnes 2025 up 3.6% 18th Africa's Development Dynamics (AfDD) Table 23 - Ecological 331.6 Hectares 2020 up 56.2% 25th PM2.5 air pollution, population exposed to levels exceeding WHO 100.0% 2017 unchanged 1st Dollar value of all resources made available to strengthen 646,810 2023 up 993.7% 100th Adjusted rural to urban parity index for achieving a minimum 0.6214 2018 down 12.0% 32nd