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Every year, Mercer, one of the world's largest HR consultancy firms, releases its Quality of Living Index, which looks at the cities that provide the best quality of life.
Now we take a look at what cities are ranked as providing the worst quality of life.
The ranking is one of the most comprehensive of its kind and is carried out annually to help multinational companies and other employers compensate employees fairly when placing them on international assignments, according to Mercer.
Looking at 450 cities across the world, Mercer takes into account the following metrics to judge which cities made the list for the best quality of life — which therefore shows what it feels are the best and worst: