|
Legal standard values |
Voluntary standard values |
Achievement in 2004 |
Compliance |
| Air Pollution Control Law |
[Particulate] concentration |
Not exceeding 0.3g/Nm3 |
Not exceeding 0.27g/Nm3 |
0.012g/Nm3 |
 |
| Nitrogen oxides |
90ppm |
81ppm |
65ppm |
 |
| Sulfur oxides (No.3 furnace) |
Not exceeding 0.62Nm3/h |
Not exceeding 0.56Nm3/h |
0.11Nm3/h |
 |
| (Nos.1 and 2 furnaces) |
Not exceeding 1.5Nm3/h |
Not exceeding 1.35Nm3/h |
0.03Nm3/h |
 |
| Sewerage Law |
Hydrogen ion concentration (pH) |
5.7~8.7 |
5.9~8.5 |
6.0~8.2 |
 |
| Normal hexane extracted substances |
Not exceeding 30mg/L |
Not exceeding 28mg/L |
Not exceeding 20mg/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) |
Not exceeding 59dB |
 |
|
Not exceeding 70 dB (Industrial area: Daytime) |
Not exceeding 66dB |
 |
| Saitama Plant |
Not exceeding 65dB |
Not exceeding 63dB |
Not exceeding 58dB |
 |
| Vibration Regulation Law |
Mitaka Plant |
Not exceeding 60 - 65 dB (Residential and industrial area) |
Not exceeding 57dB |
 |
| Saitama Plant |
Not exceeding 65dB |
Not exceeding 63dB |
Not exceeding 44dB |
 |