The levels of pollutants put almost three times as many people in these 600 neighborhoods at risk of developing cancer compared to the national average.
"The levels of 80 cancer-causing substances released by automobiles, factories and other sources in these areas exceed a 100 in 1 million cancer risk. That means that if 1 million people breathed air with similar concentrations over their lifetime, about 100 additional people would be expected to develop cancer because of their exposure to the pollution.
The average cancer risk across the country is 36 in 1 million, according to the National-Scale Air Toxics Assessment, which will be released by the EPA on Wednesday."
Thanks to Grist