What if a whole city could sense changes you cannot see?

Urban systems could respond to local problems before they become citywide emergencies.

Cities usually learn about some problems only after residents report them: a flood-prone street, dangerous air quality or a water system failure. Better networks of sensors, satellite observations and local computing could reveal developing patterns sooner. That could help city teams target inspections, manage emergencies and use resources more intelligently. The exciting possibility is a city that responds to conditions as they unfold instead of relying only on past reports. Privacy, sensor accuracy and public accountability are essential parts of making that future worthwhile.