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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. Please note that constraints exist in this type of ...
With the improvements made to the IPE website and thus China Pollution Map Database, over the last two years the number of official government-sourced violation records, from all regions in China, added to the China Pollution Map Database, has grown by over 40,000, each having its own particular circumstances and need for a prompt and effective ...
China reversed a five-year trend of declining levels of pollution, the report found. Chinese cities used to dominate global rankings of the world’s worst air quality but a raft of clean air ...
One of the fastest-growing cities in China, Chongqing has extremely high levels of air pollution because of coal-burning by power plants and industry. The poor air quality is sickening the city's ...
Air pollution has been a consistent and ongoing nuisance in Phoenix — along with five other cities in Arizona, it’s tied for the worst air quality in the nation. According to research group ...
Map of PM2.5 pollution over China from April to August 2014. Air pollution is a major public health issue in China. Over the past three decades, the rapid development of China has resulted in excessive emissions of greenhouse gases. Among the 337 cities, more than 40 percent of the major air pollutant concentrations exceeded Chinese standards. [29]
The World Bank estimates that 16 of the world's most-polluted cities are located in China. [40] Coastal pollution is widespread, leading to declines in habitat quality and increasing harmful algal blooms. [41] The largest algal bloom recorded in history occurred in China around the southern Yellow Sea in 2008, and was easily observed from space ...