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ResellerRatings is an online ratings site where consumers submit ratings and reviews of online retailers, and online retailers participate to respond to reviewers and to gather reviews from their customers post-purchase. As of July 11, 2017, the site had over 6.2 million user-submitted reviews for 202,000 stores. [citation needed]
Particulate matter (PM) is generally classified into two main size categories: PM 10 and PM 2.5. PM 10, also known as coarse particulate matter, consists of particles 10 micrometers (μm) and smaller, while PM 2.5, also called fine particulate matter, consists of particles 2.5 μm and smaller. [29]
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The guidelines stipulate that PM 2.5 should not exceed 5 μg/m 3 annual mean, or 15 μg/m 3 24-hour mean; and that PM 10 should not exceed 15 μg/m 3 annual mean, or 45 μg/m 3 24-hour mean. [2] For ozone (O 3 ), the guidelines suggest values no higher than 100 μg/m 3 for an 8-hour mean and 60 μg/m 3 peak season mean. [ 2 ]
The World Health Organization's recommended limit is 10 micrograms per cubic meter, although there are also various national guideline values, which are often much higher. Air pollution is among the biggest health problems of modern industrial society and is responsible for more than 10 percent of all deaths worldwide (nearly 4.5 million ...
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This list contains the top 500 cities by PM2.5 annual mean concentration measurement as documented by the World Health Organization covering the period from 2010 to 2022. 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.
The cleanest city in this report is Zürich, Switzerland with PM 2.5 levels of just 0.5 μg/m 3, placed first in both 2019 and 2022. The second cleanest city is Perth , with 1.7 μg/m 3 and PM 2.5 levels dropping by −6.2 μg/m 3 since 2019.