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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 caused an additional two million premature deaths in 2019.
IQAir used as its primary indicator of each country or territory’s air quality the average concentration of PM2.5, or particulate matter with a diameter of 2.5 micrometers or smaller, measured ...
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 quality technology company IQAir reports that Hanoi, Vietnam, has the worst air pollution of any city on Earth, with levels of hazardous small particles, known as PM2.5, measured at 266 micrograms per cubic metre. International relations. Egypt–Syria relations
IQAir also operates AirVisual, a real-time air quality information platform. [ 3 ] [ 4 ] As of February 2020, it had around 500 employees worldwide, 150 of them in China, and its most important markets were Asia and North America .
Air Quality Index (AQI) is a number used to communicate the level of pollution in the air and it essentially tells you the level of pollution in the air in a given city on a given day. The AQI of Delhi was placed under the "severe-plus category" when it touched 574, by the System of Air Quality and Weather Forecasting And Research. [49]
The 2022 World Air Quality Report by IQAir reveals that Peshawar, the second most polluted city in Pakistan, holds the fifth position worldwide in terms of pollution. The city has an average PM2.5 concentration of 101.4 μg/m 3. [3] Air pollution levels in Peshawar are 12 to 16 times higher than the World Health Organization (WHO) quality ...
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 ...