Urban social problems include inadequate housing, pollution, and overcrowding. Shortages in housing have led to the formation of slums - areas of substandard housing lacking basic facilities where poverty and disease are prevalent. Pollution results from industrial waste discharged into the air, water, and environment. Transportation and access to resources like water have also been challenging in cities due to large populations. Other issues include a decline in religious values, weakening family structures, rising crime, and a loss of social controls.