The World Health Organization's recommended limit is 10 micrograms per cubic meter, although there are also various national guideline values, which are often much higher.
Air pollution is among the biggest health problems of modern industrial society and is responsible for more than 10 percent of all deaths worldwide (nearly 4.5 million premature deaths in 2019), according to The Lancet.
Air pollution is a particularly big problem in emerging and developing countries, where global environmental standards often cannot be met.
[1] All data are valid for the year 2022 and are taken from the Air Quality Life Index (AQLI) of the University of Chicago.
[2] All data are valid for the year 2018-2023 and are taken from the IQAir 2023 World Air Quality Ranking[3][4][5][6]