The United States of America (USA), also known as the United States (U.S. or US) or America, is a country mainly located in North America. It chiefly consists of 50 states and 5 territories and had a population of 328 million people in 2019.
The first recorded use of the name “America” was in 1507 when it appeared on a map produced by a German cartographer who wanted to honour an Italian explorer by the name of Amerigo Vespucci.
Looking back at the figures from 2020 on the IQAir website the US obtained an overall ranking of 84 out of a total of 106 world cities. The average annual figure was US AQI 40, in comparison to Bangladesh which was the most polluted country with a US AQI figure of 162.
The cleanest city was Waimea, Hawaii with a figure of just 9, whereas the most polluted city was Yosemite Lakes, California with a figure of 107.