List of countries by air pollution

The following list of countries by air pollution sorts the countries of the world according to their average measured concentration of particulate matter (PM2.5) in micrograms per cubic metre (μg/m3). The World Health Organization's recommended limit is 10 micrograms per cubic metre, although there are also various national guideline values, which are often much higher.

Source: Wikipedia — List of countries by air pollution (CC BY-SA 4.0)