Have a look at night and see all the gas burners on the rigs constantly going in the gulf, not to mention the others based on land. Given theres virtually no plant life to soak up the pollution it just hangs around in the lower atmosphere, you will see it as an orange brown haze.
Ive been in Kuwait and the the petrochemical smell from the refinery's is almost choking, glad I left the region for my healths sake.