Air Pollution Endangers Lives of Six in 10 Americans

"Particle Pollution State of the Air 2009 grades counties for both 24-hour and
year-round levels of particle pollution – a toxic mix of microscopic
soot, diesel exhaust, chemicals, metals and aerosols.
“It is the most dangerous and deadly of the outdoor air pollutants that are
widespread in America,” the Lung Association says in its report...

("Es el más peligroso y mortal de los contaminantes del aire exterior que son
ampliamente difundido en América ", dice la Asociación de Pulmón en su informe. )