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Site data

Hofu Plant

Nishinoura District

Nishinoura District

Nishinoura District

Address: 888-1 Nishinoura, Hofu-shi, Yamaguchi, Japan
Operations started: September 1982
Major products: Passenger cars
ISO14001 certification: September 1998
Site area (floorspace): 792,000 square meters (297,000 square meters)


  • Atmospheric pollutants
Atmospheric pollutants Unit Regulation Actual(max.)
NOx Boilers ppm 150 48
130 72
Drying ovens ppm 230 82
Ash Boilers g/m³N 0.10 0.002
Drying ovens g/m³N 0.35 0.1
0.30 0.005
0.20 0.026
SOx K-value regulation - 4.5 0.001
Total pollutant load control m³N/h 35.92 0.031
VOC Painting facilities ppm 700 300
  • Water pollutants (Wastewater Drainage Destination: Oumi Bay)
Water pollutants Unit Regulation Actual
Max. Min. Avg.
pH - 5.0 to 9.0 7.1 6.4 6.8
COD mg/L 40 10.8 0.3 6.0
SS mg/L 30 2.6 ND < 1.3
Oil mg/L 2 ND ND ND
Zinc mg/L 2 0.4 0.02 0.2
Total nitrogen mg/L 60 10 0.8 3.7
Total phosphorus mg/L 8 2.29 0.12 0.99
Coliform groups colonies/cm³ 3,000 10 10 10
Boron mg/L 230 ND ND ND
Fluorine mg/L 15 0.83 0.44 0.64
Ammonia, ammonium, nitrous acid, and nitrous acid compounds mg/L 100 3.1 2 2.6

The following substances were not detected: cadmium, cyanogen, organic phosphorus, lead, hexavalent chromium, arsenic, mercury, alkyl mercury, PCBs trichloroethylene, tetrachloroethylene, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, 1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,3-dichloropropene, thiuram, simazine, thiobencarb, benzene, selenium, 1,4-dioxane, phenol, copper, soluble iron, soluble manganese, and chromium.

  • Volume of PRTR-designated Pollutants Emitted and Transferred in FY March 2013

Unit:(kg/year)
(Items marked with an asterisk (*) are Class 1 designated chemical substances of which 500 kg/year or more are handled.)
(Other items are Class 1 designated chemical substances of which 1,000 kg/year or more are handled.)

Substance No. Substance group Amount handled   Volume emitted Amount consumed Amount disposed Amount transferred Amount recycled
Air Water Soil Waste products
1 Water-soluble zinc compounds 15,274 0 244 0 244 13,350 1,680 0 0
53 Ethyl benzene 97,713 53,971 0 0 53,971 33,418 10,324 0 0
80 Xylene 295,490 112,916 0 0 112,916 139,965 28,364 0 14,245
296 1,2,4-trimethylbenzene 130,919 20,281 0 0 20,281 88,383 10,849 0 11,406
297 1,3,5-trimethylbenzene 29,231 14,311 0 0 14,311 5,779 3,420 0 5,721
300 Toluene 553,948 183,663 0 0 183,663 331,600 19,369 0 19,316
309* Nickel compounds 2,997 0 360 0 360 1,034 0 1,603 0
355 Bis (2-ethylhexyl) phthalate 3,147 0 0 0 0 3,053 94 0 0
392 n-Hexane 84,377 211 0 0 211 83,200 966 0 0
400* Benzene 16,522 21 0 0 21 16,334 167 0 0
411* Formaldehyde 3,720 1,332 0 0 1,332 0 2,388 0 0
438 Manganese and its compounds 3,994 0 221 0 221 2,502 0 1,263 8
448 Methylnaphthalene 11 0 0 0 0 0 11 0 0
412 Manganese and its compounds 26 0 0 0 0 15 0 11 0
Total 1,237,369 386,706 825 0 387,531 718,633 77,632 2,877 50,696

Nakanoseki District

Nakanoseki District

Nakanoseki District

Address: 415-8 Hamakata, Hofu-shi, Yamaguchi, Japan
Operations started: December 1981
Major products: Transmissions
ISO14001 certification: September 1999
Site area (floorspace): 537,000 square meters (100,000 square meters)


  • Atmospheric pollutants
Atmospheric pollutants Unit Regulation Actual(max.)
NOx Melting furnaces ppm 180 32
Ash Heating furnaces g/m³N 0.25 < 0.002
0.20 < 0.002
Melting furnaces g/m³N 0.20 0.041
SOx K-value regulation - 4.5 0.06
Total pollutant load control m³N/h 10.44 0.079
  • Water pollutants (Wastewater Drainage Destination: Oumi Bay)
Water pollutants Unit Regulation Actual
Max. Min. Avg.
pH - 5.0 to 9.0 7.7 6.5 7.6
COD mg/L 40 11.2 4.4 6.7
SS mg/L 30 19.0 19.0 19.0
Oil mg/L 2 ND ND ND
Zinc mg/L 2 0.23 0.06 0.10
Total nitrogen mg/L 60 12.6 1.6 6.2
Total phosphorus mg/L 8 0.91 0.03 0.14
Coliform groups colonies/cm³ 3,000 22 1 12
Boron mg/L 230 ND ND ND
Fluorine mg/L 15 0.1 ND < 0.05
Ammonia, ammonium, nitrous acid, and nitrous acid compounds mg/L 100 7.2 7 7.1

The following substances were not detected: cadmium, cyanogen, lead, hexavalent chromium, arsenic, mercury, alkyl mercury, trichloroethylene, tetrachloroethylene, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, 1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,3-dichloropropene, thiuram, simazine, thiobencarb, benzene, selenium, 1,4-dioxane, phenol, copper, soluble iron, soluble manganese, and chromium.

  • Volume of PRTR-designated Pollutants Emitted and Transferred in FY March 2013

No applicable chemical substances subject to reporting. (The volume of the PRTR-designated groups' substances handled is less than the designated volume subject to reporting.)

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