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Study says tugboats are sootiest for amount of fuel used ...
They may be relatively small, but tugboats puff out more soot for the amount of fuel used than other commercial vessels, according to a new study.

Health Highlights: May 1, 2008 - healthfinder.gov
Pittsburgh is the first city outside of California to be named the sootiest in the nation, but Los Angeles is still the all-around air pollution leader, says an American Lung Association annual report released Thursday. ...

pittsburgh surpassed los angeles as a nation sootiest city (ap)
ap - a city outside california has, for the first time, was named the sootiest in the nation, one of the categories of the association american lung used to determine the most polluted cities in the country.

Pittsburgh is America's Sootiest City
Pittsburgh is America's Sootiest City.

Group identifies the USA's sootiest city - On Deadline - USATODAY.com
Group identifies the USA's sootiest city. Like this story? Share it with Yahoo! Buzz. Pittsburgh is the nation's sootiest city, according to the American Lung Association. This is the first time that they've bestowed the title on a city ...

World Prout Assembly: Pittsburgh Surpasses LA as Sootiest US City
Pittsburgh Surpasses LA as Sootiest US City. Ozone - a gas that forms when sunlight reacts with emissions from motor vehicles, factories and power plants - irritates the respiratory tract and can cause asthma attacks, coughing, ...

Pittsburgh Surpasses Los Angeles As Nation's Sootiest City
A city outside California has for the first time been named the sootiest in the nation, one of the categories the American Lung Association uses to determine the most polluted cities in the country. Pittsburgh overtook Los Angeles in ...

We are the Nation's Sootiest City
I never would have thought that Pittsburgh would top the list as the "sootiest city" in the US these days. Guess we Pittsburghers need to think seriously about our air quality and work to clean it up.

la not the sootiest!
pittsburgh tops los angeles as sootiest city in the nation. but, don't worry, angelenos, the southern california metropolis is keeping the overall pollution title.

and sootiest city title goes to ...
the title of sootiest city goes outside california for the first time.