Home > About Toshiba > Environment > Greening of Process > Management of Chemical: Impacts on Air and Water
Toshiba Group is working to grasp the extent of emissions of sulfur oxides (SOx) and nitrogen oxides (NOx), both of which are major causes of air pollution, as well as water pollutants and ensure appropriate management of such emissions. Each production site voluntarily sets the maximum permissible levels of concentrations for these substances and complies with these prescribed standards, but total emissions fluctuate as production volumes increase or decrease.
Production sites in Europe and North America have already applied to wastewater the environmental impact risk assessment method (whole effluent toxicity (WET) method), which uses biological indicators. Those in Japan have also started to consider using it as a new indicator of wastewater management.
Impacts on the atmosphere

Amount of impact = concentration of each substance × amount of substance emitted (based on the Air Pollution Control Act)
Impacts on the hydrosphere

Amount of impact = concentration of each substance × amount of substance discharged (based on the Water Pollution Control Act)
Starting FY2007, data include those for Sigma Power Ariake and Sigma Power Tsuchiura.
The Oita Operations takes in and uses industrial water for semiconductor manufacturing, which comes from clear waters from the Ono River, one of the cleanest streams in Japan. The used industrial water is categorized into detailed types for advanced treatment and treated such that its quality will become equivalent to the original waters to such an extent that it can even support carp, following which it will be returned to the river.

Wastewater treatment facility