8- Iran
Pollution level: 124 ug/m3
Iran has oil reserves and natural gas reserves larger than most countries in the world. But its industry is not as developed; therefore, nationally produced gas has caused a lot of air pollution. The industry cannot develop fast enough and uses old machinery that does not refine the oil as well as it should, leaving a lot of waste behind that pollutes the air and water. Iran is also home to one of the most polluted cities in the world, Ahvaz, a city of over a million people that has pollution rates that make the air nigh unbreathable.
