Pittsburgh is the second largest city in the Commonwealth of Pennsylvania with a population of 334,563
and the 20th largest metropolitan area in the United States, and the 50th largest metropolitan area in North America,
with a population of 2,358,695.
It is the county seat of Allegheny County, Pennsylvania.
Built on land surrounding the confluence of the Allegheny and Monongahela rivers,
where they merge to form the Ohio river, Pittsburgh features a skyline of 151 high-rise buildings, 446 bridges,
two inclined railways and a pre-revolutionary fortification.
Residents of the city are called Pittsburghers.
The downtown area is located on the triangular parcel at the confluence of the rivers.
Pittsburgh is noted for bridges of all types throughout the city and is commonly known as
the "The City of Bridges" or "The Bridge Capital" of the United States.
Pittsburgh's other nickname is "The Steel City" due to its one-time prominence in steel making.
Though Pittsburgh's economy was traditionally fueled by heavy manufacturing to the detriment
of local air and water quality, today it is largely based on healthcare, education, technology and financial services.
Primarily due to a series of factories from Pittsburgh's old economy, the city still has a pollution problem
in regards to particulate matter in the atmosphere; however, other categories such as ozone are relatively low.
Pittsburgh is the principal cultural and economic influence in the eastern Ohio River Valley.
Also, though the city proper is diminishing in population, some areas of the Pittsburgh metropolitan area
continue to grow.
Nevertheless, because of its low cost of living, economic opportunities, education, transportation and
medical infrastructure, Pittsburgh is consistently ranked high in livability surveys.
In 2007, Pittsburgh was named "America's Most Livable City" by Places Rated Almanac,
and "America's Best City for Relocating Families" in 2008 by Worldwide ERC,
a relocation services industry trade group.
As of April 4, 2008, the city and Allegheny County, are discussing a plan to merge as early as 2009.
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