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[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. Click on the arrows next to the table's headers to have the most polluted cities ranked first.
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 ...
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.
The number of people living with levels of air pollution that can significantly affect their health climbed from about 119 million in last year’s data to 131 million in the current data ...
June 7, 2023; Columbus, Ohio, USA; A bicyclist rides through Genoa Park along the Scioto River in 2023 as smog from Canadian wildfires affects the downtown view.
Growing evidence that air pollution—even when experienced at very low levels—hurts human health, led the WHO to revise its guideline (from 10 μg/m 3 to 5 μg/m 3) for what it considers a safe level of exposure of particulate pollution, bringing most of the world—97.3 percent of the global population—into the unsafe zone.
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The median age in the city was 37.1 years. 24.1% of residents were under the age of 18; 10.9% were between the ages of 18 and 24; 23.7% were from 25 to 44; 26% were from 45 to 64; and 15.3% were 65 years of age or older. The gender makeup of the city was 48.3% male and 51.7% female.