Air pollution is a global problem that affects all major cities in the world and reach every continent.

But air pollution is also a source of strong inequalities between cities and countries. Paris is two times more polluted than San Francisco, Beijing air is 10 times more polluted than London, New Delhi is almost two times worse than Beijing, etc.

Have a look at the air pollution in cities all over the world with the Plume Air Report.

We have seen in the newspapers, on television and more recently in this documentary,  cities like Beijing and New Delhi covered by smog. A WHO study reveals the ranking of the most polluted cities in the world and they are often not those we could expected.

In India, for example, the city of Ludhiana is much more polluted than New Delhi. Here are the top 10 most polluted cities of the world:

  1. Ahwaz, Iran
  2. Ulaanbaatar, Mongolia
  3. Sanandaj, Iran
  4. Ludhiana, India
  5. Quetta, Pakistan
  6. Kermanshah, Iran
  7. Peshawar, Pakistan
  8. Gaborone, Botswana
  9. Yasouj, Iran
  10. Kanpur, India

Read more here.