US Department of Housing and Urban Development

Jason DeBruyn / WUNC

200 families living in the McDougald Terrace public housing complex in Durham have been temporarily moved into hotels because of ongoing problems with carbon monoxide. The Durham Housing Authority put in place a voluntary evacuation order Friday as it conducts testing at the units. 

In many cities, the crumbling housing projects that once housed the nation's poorest families are being replaced by mixed- income housing developments.

The US Department of Housing and Urban Development has made mixed-income housing the preferred model for providing affordable housing. The concept is to deconcentrate individuals who earn lower incomes and to assist those families in maintaining a residence in a community that serves various income levels. A recent study examines the effects of low-income children living alongside more affluent neighbors.