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In 2024, the Los Angeles-Long Beach-Riverside area ranked the 1st most ozone-polluted city, the 6th most polluted city by annual particle pollution, and the 11th most polluted city by 24-hour particle pollution. [3] Both ozone and particle pollution are dangerous to human health.
The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 countries. Air quality in the database is represented by the annual mean concentration of particulate matter ( PM10 and PM2.5, i.e. particles smaller than 10 or 2.5 micrometers, respectively).
Las Vegas was the cleanest major city in the U.S. For the first time in the history of this report, Canada was the most polluted country in Northern America, with the region's 13 most polluted ...
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Here’s where the Central Valley city ranked in terms of air quality. Fresno is among top 10 most polluted cities in U.S., American Lung Association. Here’s why
The study found that people living in the most polluted city (Steubenville) were 26 percent more likely to die than those in the least polluted city (Portage), [7] [11] suggesting an association between particulate pollution and higher death rates in urban areas: "Although the effects of other, unmeasured risk factors cannot be excluded with ...
The American Lung Association’s State of the Air report for 2024 ranked U.S. cities and graded counties based on ozone and particle pollution during 2020, 2021 and 2022, according to its website.
The most polluted river in Latin America and it is considered one of the ten most polluted places globally, with very high levels of lead. [214] Large amounts of industrial waste from the numerous factories along the river, especially tanneries. [215]