Pittsburgh summit examines air quality's effect on health

Pittsburgh summit examines air quality's effect on health

Pittsburgh summit examines air quality's effect on health

Now watching

Next video starts in : 7 Play

Pittsburgh summit examines air quality's effect on health

Pittsburgh summit examines air quality's effect on health
Replay video
Up next

'Let us never fear to negotiate' -- Obama quoting Kennedy at Institute dedication

'Let us never fear to negotiate' -- Obama quoting Kennedy at Institute dedication Up next

'Let us never fear to negotiate' -- Obama quoting Kennedy at Institute dedication