<P> 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 . The strong relationship between AQI and ozone levels may be found on air pollution maps . </P>
<P> 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 . The strong relationship between AQI and ozone levels may be found on air pollution maps . </P>
what is the smoggiest city in the united states
what is the smoggiest city in the united states
Los Angeles
Los Angeles