Rio Tinto is very conscious of its environmental stewardship, constantly pursuing all avenues available, as well as aggressively researching new methods to eliminate the smelting processes potential negative impact on the environment. Before being released into the environment all forms of potential pollution, including the steam and vapor emissions produced by the refinery are vigorously and meticulously scrubbed and cleaned to exacting standards. Pure quality sulfuric acid, held in rail cars such as these, is a byproduct of the smelting process emissions scrubbing and cleaning procedures. It is from here that it is shipped for use by many other industrial processes.