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Indication of how other pollution is trending. but there are other pollutants out there causing harm. >> we have about half the nation who lives in counties that have unhealthy levels air pollution. >> reporter: thats about 140 or more million americans who still live areas with air. the worst in the united states for even that city made big improvements. l.a. has cut it air pollution bs a problem for europe, isnt that right scientists we talked to today say we have a problem with par tick la la...