Karaj is the capital of Alborz Province, Iran, and effectively a satellite city of Tehran.
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However, the present-day city of Karaj is mostly the result of modern industrial development in the 20th century.
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The majority of the residents of Karaj are Persians, with Azerbaijanis making up the second major ethno-linguistic group of the city.
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Tehran–Karaj Highway is one of the busiest sections in Iran with AADT of 217084.
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Aerial transport of Karaj is served by the Payam International Airport, which was established in 1990, and was officially opened in 1997.
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Karaj Metro is an efficient way to travel inside the city.
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The establishment of the factory Zowb Ahan e Karaj was halted by the beginning of the Second World War, and it was never launched.
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Karaj was formerly home of the Persian Gulf Pro League club, Saipa, for several years and this club won its first league championship in this city, however in 2014 the team relocated to Tehran.
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Karaj has an international tennis complex which is used to training and tournaments.
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