what is the smoggiest city in the united states
Air pollution in the United States Los Angeles has the most contaminated air in the country. With a population of roughly over 10 million, the Los Angeles area is a large basin with the Pacific Ocean to the west, and several mountain ranges with 11,000-foot peaks to the east and south. Diesel engines, ports, motor vehicles, and industries are main sources of air pollution in Los Angeles. Frequent sunny days and low rainfall contribute to ozone formation, as well as high levels of fine particles and dust.[72] The strong relationship between AQI and ozone levels may be found on air pollution maps.[73]
New York City The City of New York, often called New York City (NYC) or simply New York, is the most populous city in the United States.[9] With an estimated 2017 population of 8,622,698[7] distributed over a land area of about 302.6 square miles (784Â km2),[10][11] New York City is also the most densely populated major city in the United States.[12] Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, the largest metropolitan area in the world by urban landmass[13] and one of the world's most populous megacities,[14][15] with an estimated 20,320,876 people in its 2017 Metropolitan Statistical Area and 23,876,155 residents in its Combined Statistical Area.[4][5] A global power city,[16] New York City has been described as the cultural, financial, and media capital[17][18] of the world,[19][20][21][22][23] and exerts a significant impact upon commerce,[23] entertainment, research, technology, education, politics, tourism, and sports. The city's fast pace[24][25] defines the term New York minute.[26] Home to the headquarters of the United Nations,[27] New York is an important center for international diplomacy.[28]