5- Saudi Arabia
Pollution level: 143 ug/m3
Saudi Arabia is the world’s largest producers and exporters of petroleum. It also the second largest oil producer and holds one-fifth of the world’s oil reserves. Oil, power, desalination and other industrial activities near the coast have led to sewage outflows, and oil and chemical plumes. This has led to lots of respiratory diseases in its citizens. The country is trying to clean its air with new technology, but its oil industry seems unstoppable.
