The term 'BLIGHT URBAN' can be broken down into two crossword solutions: SLUM and SMOG. A SLUM is an area of a city characterized by poverty, overcrowding, and substandard housing. Slums are often associated with crime, unemployment, and poor health. SMOG is a type of air pollution caused by the burning of fossil fuels. It is a combination of smoke and fog that can cause respiratory problems and other health issues.