50 Cleanest (Dirtiest) Cities in America

50 Cleanest (Dirtiest) Cities in America: "What's the cleanest big city in the U.S.? How about the dirtiest? In our July issue, we decided to find out, by analyzing data to score each of the 50 largest cities on air quality, water quality, industrial pollution (toxics), Superfund sites, and sanitation."

Boston ranked relatively well in the air and toxics categories, but very low in water, hazardous waste, and sanitation.