Complying with values specified by law

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Compliance with legal standard values in 2005 is described below:
Strict voluntary standard values are being applied to plant checks.

Legal standard values Voluntary standard values Achievement in 2006 Compliance
Air Pollution Control Law [Particulate] concentration Not exceeding 0.3g/Nm³ Not exceeding 0.27g/Nm³ 0.030g/Nm³
Nitrogen oxides 90ppm 81ppm 64ppm
Sulfur oxides (No.3 furnace) Not exceeding 0.62Nm³/h Not exceeding 0.56Nm³/h 0.08Nm³/h
(Nos.1 and 2 furnaces) Not exceeding 1.5Nm³/h Not exceeding 1.35Nm³/h 0.11Nm³/h
Sewerage Law Hydrogen ion concentration (pH) 5.7-8.7 5.9-8.5 6.3-8.3
Normal hexane extracted substances Not exceeding 30mg/L Not exceeding 28mg/L Not exceeding 2.0 - 20.6mg/L
Trichloroethylene Not exceeding 0.3mg/L Not exceeding 0.15mg/L Lower than 0.03mg/L
Tetrachloroethylene Not exceeding 0.1mg/L Not exceeding 0.05mg/L Lower than 0.01mg/L
Dichloromethane Not exceeding 0.2mg/L Not exceeding 0.1mg/L Lower than 0.02mg/L
Other harmful substances

Not exceeding standard value of discharge
Noise Regulation Law Mitaka Plant Not exceeding 60 dB (Adjacent residential area: Daytime) *1Not exceeding 48 - 64dB
(The maximum values are for when exhaust fans of adjacent facilities are operating.)
Not exceeding 70 dB (Industrial area: Daytime) Not exceeding 51 - 65dB
Saitama Plant Not exceeding 65dB Not exceeding 63dB Not exceeding 48 - 56dB
Vibration Regulation Law Mitaka Plant Not exceeding 60 - 65 dB (Residential and industrial area) Not exceeding 28.4 - 47.8dB
Saitama Plant Not exceeding 65dB Not exceeding 63dB Not exceeding 22 -42dB

*1 It is confirmed that the value is "Not higher than 56 dB" when the exhaust fans of external adjacent facilities are not in operation.
(The observed values shown above are measured at "In-house fixed points and the time" in accordance with the legal criteria.)

*This policy current as of May 31, 2007.

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