We have achieved significant emission reductions over the years. The major achievements are related to greenhouse gases as well as dust and particle emissions. The closure of our former Søderberg lines has reduced plant emissions of PAH, greenhouse gases, dust, particles and fluoride. In the last five years, our emissions of fluoride and PAH to air, per metric ton of primary aluminium produced, have decreased by 20 and 66 percent, respectively. With our new assets in Brazil, Hydro's SO2 and NOx emissions have increased significantly. SO2 emissions were 29,356 mt in 2011, while NOx emissions were 9,037 mt.
The enlargement of the wastewater treatment plant in Grevenbroich, Germany, initiated in 2010, led in 2011 to reductions in the chemicals needed in the process and to a clear reduction in the contaminants charged. As a response to neighborhood claims regarding odor, we initiated a dialogue with local stakeholders on a regular basis in the Grevenbroich plant. Measures were agreed upon and an internal project, "Odor emissions in Barrenstein", was set up.
For detailed information about Hydro's emissions, see Hydro's Annual Report 2011 page 77-78.
