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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). [1 ...
Below is a list of 526 cities sorted by their annual mean concentration of PM2.5 (μg/m 3) in 2022. [1] [2] By default the least polluted cities which have fewest particulates in the air come first. Click on the arrows next to the table's headers to have the most polluted cities ranked first. Please note that constraints exist in this type of ...
The following list of countries by air pollution sorts the countries of the world according to their average measured concentration of particulate matter in micrograms per cubic meter (μg/m 3). The World Health Organization's recommended limit is 5 micrograms per cubic meter, although there are also various national guideline values, which are ...
To rank the 25 cities with the most pollution, we relied on data provided by the World Air Quality Report 2021 by IQAir. As mentioned earlier, air pollution is the most damaging form of pollution ...
New York City 'worst polluted city' in the world as air quality plummets. ... New York is once again the most polluted major city in the world right now, according to live rankings by IQAir, an ...
Pakistan remained one of the world's three smoggiest countries in 2023, as Bangladesh and India replaced Chad and Iran, with particulate matter about 15 times the level recommended by the World ...
The most commonly used air quality index in the UK is the Daily Air Quality Index recommended by the Committee on the Medical Effects of Air Pollutants (COMEAP). [39] This index has ten points, which are further grouped into four bands: low, moderate, high and very high. Each of the bands comes with advice for at-risk groups and the general ...
Karachi's air quality index (AQI) has risen to an unhealthy level of 193, making it the fourth most polluted city in the world. [2] The city's AQI is often among the highest globally, indicating severe levels of air pollution. [3] Fine particulate matter (PM2.5) plays a major role in air pollution in Karachi. The concentration of PM2.5 in the ...