To begin exploring how air pollution may affect your community, use this interactive map of more than 17,000 facilities that have emitted hazardous chemicals into the air. Color-coded dots and scores of one to five smoke stacks are based on an EPA method of assessing potential health risk in airborne toxins from a given facility. Higher numbers are linked to higher potential risks to human health. Zoom in to your neighborhood by clicking on the map or use the search box on the full screen version of the map to find the area you're looking for.
(Source: Analysis of Environmental Protection Agency databases by Elizabeth Lucas, Center for Public Integrity and Robert Benincasa, NPR. Credits: Map by Nelson Hsu/NPR; developmentseed.org)