8.1
Human populations
Population change, Demographic indicators, Age–sex pyramids, DTM, Population policy, Environmental migration
8.2
Urban systems and urban planning
Urban ecosystems, Migration, Urbanization, Systems flows, Sustainable planning, Ecological design, Circular cities, Green architecture
8.3
Urban air pollution
Primary and secondary pollutants, particulate matter, acid rain, pollution management, photochemical smog, environmental inequality
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