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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).
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.
After a steady 23-year decline in US pollution levels through 2017, the American Lung Association's State of the Air 2022 report found a sharp uptick in pollution over the past five years. [ 96 ] According to the American Lung Association's State of the Air 2024 report, California retains its position of being the state with the most metro ...
The reports provide guidelines intending to give guidelines to reduce the health effects of air pollution. [2] 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]
Difference between levels of PM 2.5 in the air in 2019 and 2022 among 70 capital cities [284] To analyse the air pollution trend, 480 cities around the world (Ukraine excluded) was mapped by air experts [284] to calculate the average PM 2.5 level of the first nine months of 2019 against that of 2022. [285]
Air pollution can affect nearly every organ and system of the body, negatively affecting nature and humans alike. Air pollution is a particularly big problem in emerging and developing countries, where global environmental standards often cannot be met. The data in this list refers only to outdoor air quality and not indoor air quality, which ...
Air Pollution Level Air Pollution Category Health Implications Recommended Precautions 0-50 Level 1 Excellent No health implications. Everyone can continue their outdoor activities normally because the air is not polluted. 51-100 Level 2 Good Some pollutants may slightly affect very few hypersensitive individuals.
Further analysis done in 1979 and 1997 made it necessary to significantly modify the pollution standards. Atmospheric particulate matter. PM 10, coarse particles: 2.5 micrometers (μm) to 10 μm in size (although current implementation includes all particles 10 μm or less in the standard) PM 2.5, fine particles: 2.5 μm in size or less ...