Air quality grades vary across US counties

Bergen County in northern New Jersey, which borders New York City, has received a failing grade for its poor air quality, with the highest number of smog-choked days in the state over a period of three years, according to a report by the American Lung Association. The county recorded 15 days of high ozone levels from 2019 to 2021, which dropped compared to the previous three-year period. The county's high levels of car and bus traffic, including the George Washington Bridge, the busiest suspension bridge in the world, were cited as contributing factors.