With respect to the nature of the activity- hot metal operations- of the Foolad Kaviyan Company, the above result is acceptable.
The mean mercury concentrations of rain water samples were compared to the US EPA standard, in which the maximum permissible value is 0.002 mg/lit.
The annual mean concentration of Hg of precipitation was less than permissible limit. Furthermore, according to the EPA standard, the permissible limit for air is 0.1 mg/ m3,
whereas the annual Hg value in the air of Ahvaz is less than it. The highest value of the mercury at the soil sample stations was 0.10 μg/g in winter that is seems
due to presence of steel industry.