I looked up Ahwaz, Iran on Google Maps. It a city in a desert, not unlike Las Vegas, except the desert goes on much farther. Of course it is going to have an uncontrollable dust problem. The only things they could possibly do bring down the levels of dust are to encase the city in a large sci-fi dome like Logan’s Run, or move the city.
Ahwaz has 3.2 million people and moving it might be tough