Forbes Magazine just published a list of the top 25 dirtiest cities in the world. To see which cities in the world were dirtiest, they used Mercer Human Resource Consulting’s 2007 Health and Sanitation Rankings. As part of their 2007 Quality of Life Report, they ranked 215 cities worldwide based on levels of air pollution, waste management, water potability, hospital services, medical supplies and the presence of infectious disease.
All cities were positioned against New York, the base city, with an index score of 100. For the Health and Sanitation Rankings, the index scores range from the worst on the list–Baku, Azerbaijan, with a score of 27.6–to the best on the list–Calgary, Canada, with a score of 131.7
Pardon my ignorance, but I’ve never heard of the city of Baku or Azerbaijan. Here’s a wikipedia entry about Baku.