Looking at the the Air Pollution map, the most polluted city in the USA is Anchorage, Alaska. The exact reason is not immediately obvious and is most likely a combination of various pollutant sources. Research into the economy of Anchorage revealed that transportation, military, and resource extraction are three of the largest industries. The Ted Stevens Anchorage International Airport (TSAIA) is actually the world's third busiest airport for cargo traffic and the city is headquarters for several small airlines. The port of Anchorage receives 95% of all imports destined for Alaska. The military has a number of bases in the Anchorage area, their activities adding to the pollution problem. Petroleum extraction is a huge component of the Alaskan economy. It often involves drilling and heavy machine work, emitting large amounts of pollution. With ships and planes constantly streaming in and out of the city, oil extraction, and military presence, pollutants are bound to accumulate.
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