Environmental Data Performance*
(Fiscal year ending on March 31, 2018)

In addition to complying with the laws and regulations, Subaru sets and manages voluntary standards that are 20% higher than the air, water quality, noise and vibration legal standards.

* Data are measured values of major regulated substances/facilities in each plant and office.

Atmosphere
(Air Pollution Control Act, Prefectural Regulations)

Automotive Business
Gunma Plant

Main Plant

Substance Equipment/facility Unit Regulation Voluntary standard Maximum Average
NOx Paint drying oven ppm 230 184 53 32
Particulate matter Paint drying oven g/Nm3 0.2 0.16 0.003 0.002
VOC Paint booth, etc. ppm‐C 700 642 239

Yajima Plant

Substance Equipment/facility Unit Regulation Voluntary standard Maximum Average
NOx Paint drying oven ppm 230 184 50 30
Particulate matter Paint drying oven g/Nm3 0.2 0.16 0.003 0.002
VOC Paint booth, etc. ppm‐C 700 434 50
VOC Paint booth, etc. ppm‐C 400 319 102

Oizumi Plant

Substance Equipment/facility Unit Regulation Voluntary standard Maximum Average
NOx Aluminum melting oven ppm 180 144 46 38
Particulate matter Aluminum melting oven g/Nm3 0.3 0.24 0.010 0.007

Ota North Plant

​There is no applicable equipment/facility.

Tokyo Office

​There is no applicable equipment/facility.

Aerospace Company
​Utsunomiya Plant

​Main Plant

Substance Equipment/facility Unit Regulation Voluntary standard Maximum Average
NOx ​cogeneration ppm 600 480 94 88
NOx ​Drying oven g/Nm3 230 184 <100 <100
Particulate matter ​Drying oven ppm‐C 0.2 0.16 <0.001 <0.001

​South Plant and 2nd South Plant

​There is no applicable equipment/facility.

​Handa Plant

Substance Equipment/facility Unit Regulation Voluntary standard Maximum Average
SOx ​2 ton boiler ppm 1.5 1.2 0.02 <0.02
NOx ​2 ton boiler ppm 180 144 110 37
Particulate matter ​2 ton boiler g/Nm3 0.1 0.08 <0.002 <0.002

​​Handa West Plant

​​Substance ​​Equipment/facility Unit Regulation Voluntary standard Maximum Average
SOx ​2 ton boiler ppm 1.5 1.2 <0.02 <0.02
NOx ​2 ton boiler ppm 180 144 55 33
Particulate matter ​2 ton boiler g/Nm3 0.1 0.08 <0.002 <0.002

Water Quality
(Water Pollution Prevention Act, Sewerage Act, Prefectural/Municipal Regulations)

Automotive Business
Gunma Plant

​Main Plant

Item Unit Regulation
(Prefectural regulations)
Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.1~8.3 7.7 7.3 7.5
Biochemical oxygen demand (BOD) mg/ℓ 25 20 5.3 1.1 3.2
Suspended solids (SS) mg/ℓ 50 40 2.8 1.0 2.0
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 <1.0 <1.0 <1.0
Fluorine and its compounds mg/ℓ 8 6.4 2.0 0.2 0.8
Zinc content mg/ℓ 2 1.6 0.703 0.081 0.317
Soluble iron content mg/ℓ 10 8 <0.1 <0.1 <0.1
Soluble manganese content mg/ℓ 10 8 <0.1 <0.1 <0.1
Phosphorus content mg/ℓ 16 (8) 6.4 1.1 0.2 0.6
Nitrogen content mg/ℓ 120 (60) 48 6.5 2.3 4.4

[Effluent is discharged into public rivers. Measurement was conducted at two drainage outlets (New No.2 and No.5 waterways). Values for total phosphorus content and total nitrogen content are daily averages.]

Yajima Plant

Item Unit Regulation
(Prefectural regulations)
Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.1~8.3 7.4 7.3 7.4
Biochemical oxygen demand (BOD) mg/ℓ 25 20 7.0 2.9 5.0
Suspended solids (SS) mg/ℓ 50 40 5.2 2.4 3.8
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 <1.0 <1.0 <1.0
Fluorine and its compounds mg/ℓ 8 6.4 1.3 0.9 1.1
Zinc content mg/ℓ 2 1.6 2.54 0.215 1.38
Soluble iron content mg/ℓ 10 8 0.1 0.1 0.1
Soluble manganese content mg/ℓ 10 8 0.4 0.2 0.3
Phosphorus content mg/ℓ 16 (8) 6.4 0.5 0.3 0.4
Nitrogen content mg/ℓ 120 (60) 48 5.9 3.2 4.6

[Effluent is discharged into public rivers. Values for total phosphorus content and total nitrogen content are daily averages.]

Oizumi Plant

Item Unit Regulation
(Prefectural regulations)
Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.1~8.3 7.9 7.1 7.4
Biochemical oxygen demand (BOD) mg/ℓ 10 8 4.6 1.0 2.4
Suspended solids (SS) mg/ℓ 10 8 6.0 1.0 4.2
n-hexane extract content
(Mineral oil content)
mg/ℓ 3 2.4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 <1.0 <1.0 <1.0
Fluorine and its compounds mg/ℓ 8 6.4 <0.2 <0.2 <0.2
Zinc content mg/ℓ 2 1.6 0.233 0.086 0.140
Soluble iron content mg/ℓ 5 4 <0.1 <0.1 <0.1
Soluble manganese content mg/ℓ 5 4 <0.1 <0.1 <0.1
Phosphorus content mg/ℓ 16 (8) 6.4 <0.1 <0.1 <0.1
Nitrogen content mg/ℓ 120 (60) 48 13.6 2.8 8.2

[Effluent is discharged into public rivers. Values for total phosphorus content and total nitrogen content are daily averages.]

Ota North Plant

Item Unit Regulation
(Prefectural regulations)
Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.1~8.3 7.9 7.8 7.9
Biochemical oxygen demand (BOD) mg/ℓ 25 20 ‹1.0 <1.0 <1.0
Suspended solids (SS) mg/ℓ 50 40 3.2 3.2 3.2
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 <1.0 <1.0 <1.0
Fluorine and its compounds mg/ℓ 8 6.4 <0.2 <0.2 <0.2
Zinc content mg/ℓ 2 1.6 0.04 0.027 0.034
Soluble iron content mg/ℓ 10 8 0.2 0.1 0.2
Soluble manganese content mg/ℓ 10 8 0.2 <0.1 0.2
Phosphorus content mg/ℓ 16 (8) 6.4 <0.1 <0.1 <0.1
Nitrogen content mg/ℓ 120 (60) 48 1.6 1.0 1.3

[Effluent is discharged into public rivers. Values for total phosphorus content and total nitrogen content are daily averages.]

Tokyo Office

Item Unit Regulation* Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.7~8.7 5.9~8.4 8.4 8.0 8.3
Biochemical oxygen demand (BOD) mg/ℓ 300 240 230 43 126
Suspended solids (SS) mg/ℓ 300 240 240 45 102
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <4.0 <4.0 <4.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 17 <4.0 7
Total phosphorus mg/ℓ 16 12.8 8.7 3.1 4.9
Total nitrogen mg/ℓ 120 96 79.9 21 40.5
Soluble manganese mg/ℓ 10 8 0.02 0.01 0.01
Cyanogen mg/ℓ 1 0.8 <0.01 <0.01 <0.01

[Effluent is discharged into public sewer. Unit: mg/L except for pH.]

* Water Pollution Prevention Act and Mitaka City Sewer Regulation.

Aerospace Company
​Utsunomiya Plant

​Main Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5~9 5.4~8.6 8.5 6.3 7.1
Suspended solids (SS) mg/ℓ 600 480 407 <1.0 64
Biochemical oxygen demand (BOD) mg/ℓ 600 480 355 0.7 64
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 20.3 <1.0 8.4
Fluorine compounds mg/ℓ 8 6.4 1.5 <0.2 0.3
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 0.007 <0.003 0.004
Total chromium mg/ℓ 2 1.6 0.36 <0.01 0.01
Hexavalent chromium mg/ℓ 0.1 0.08 <0.02 <0.02 <0.02

[Effluent is discharged into public sewer.]

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.0~8.3 7.9 6.9 7.4
Suspended solids (SS) mg/ℓ 50 40 <1.0 <1.0 <1.0
Biochemical oxygen demand (BOD) mg/ℓ 30 24 11.8 <0.5 1.7
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 <1.0 <1.0 <1.0
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.003 <0.003 <0.003
Total chromium mg/ℓ 2 1.6 <0.01 <0.01 <0.01
Hexavalent chromium mg/ℓ 0.5 0.4 <0.02 <0.02 <0.02

[Effluent is discharged into public rivers.]

South Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5~9 5.4~8.6 8.6 6.8 7.5
Suspended solids (SS) mg/ℓ 600 480 151 2.4 45
Biochemical oxygen demand (BOD) mg/ℓ 600 480 412 5.1 102
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 17.1 <1.0 6.9
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.003 <0.003 <0.003
Total chromium mg/ℓ 2 1.6 <0.01 <0.01 <0.01
Hexavalent chromium mg/ℓ 0.1 0.08 <0.02 <0.02 <0.02

[Effluent is discharged into public sewer.]

South Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.0~8.3 8.1 6.8 7.2
Suspended solids (SS) mg/ℓ 50 40 1.6 <1.0 1.3
Biochemical oxygen demand (BOD) mg/ℓ 30 24 16.7 <0.5 2.6
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.003 <0.003 <0.003
Total chromium mg/ℓ 2 1.6 <0.01 <0.01 <0.01
Hexavalent chromium mg/ℓ 0.5 0.4 <0.02 <0.02 <0.02

[Effluent is discharged into public rivers.]

2nd South Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5~9 5.4~8.6 7.6 7 7.3
Suspended solids (SS) mg/ℓ 600 480 98 <1.0 19
Biochemical oxygen demand (BOD) mg/ℓ 600 480 100 1.2 22
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
n-hexane extract content
(Animal and plant oils and fats content)
mg/ℓ 30 24 5.1 <1.0 1.5
Fluorine compounds mg/ℓ 8 6.4 1.7 <0.2 0.5
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.003 <0.003 <0.003
Total chromium mg/ℓ 2 1.6 1.0 <0.01 0.20
Hexavalent chromium mg/ℓ 0.1 0.08 <0.02 <0.02 <0.02

[Effluent is discharged into public sewer.]

2nd South Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 5.8~8.6 6.0~8.3 7.5 6.5 7.1
Suspended solids (SS) mg/ℓ 50 40 5.2 <1.0 2.7
Biochemical oxygen demand (BOD) mg/ℓ 30 24 3.7 0.6 1.9
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <1.0 <1.0 <1.0
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.003 <0.003 <0.003
Total chromium mg/ℓ 2 1.6 <0.01 <0.01 <0.01
Hexavalent chromium mg/ℓ 0.5 0.4 <0.02 <0.02 <0.02

[Effluent is discharged into public rivers.]

​Handa Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 6~8 6.2~7.8 7.8 6.8 7.5
Suspended solids (SS) mg/ℓ 25 20 6.0 <1.0 1.8
Biochemical oxygen demand (BOD) mg/ℓ 25 20 13.0 1.0 2.8
Chemical oxygen demand (COD) mg/ℓ 25 20 15.0 1.3 5.6
n-hexane extract content
(Mineral oil content)
mg/ℓ 5 4 <0.5 <0.5 <0.5
Cyanogen mg/ℓ 1 0.8 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.005 <0.005 <0.005
Total chromium mg/ℓ 2 1.6 <0.04 <0.04 <0.04
Hexavalent chromium mg/ℓ 0.5 0.4 <0.04 <0.04 <0.04

​​Handa West Plant

Item Unit Regulation Voluntary standard Maximum Minimum Average
Concentration of hydrogen ion (pH) - 6~8 6.2~7.8 7.7 7.0 7.4
Suspended solids (SS) mg/ℓ 15 12 8.0 2.0 3.8
Biochemical oxygen demand (BOD) mg/ℓ 15 12 13.0 3.0 6.4
Chemical oxygen demand (COD) mg/ℓ 15 12 12.0 4.6 7.8
n-hexane extract content
(Mineral oil content)
mg/ℓ 2 1.6 <0.5 <0.5 <0.5
Cyanogen mg/ℓ 0.5 0.4 <0.1 <0.1 <0.1
Cadmium mg/ℓ 0.03 0.024 <0.005 <0.005 <0.005
Total chromium mg/ℓ 0.2 0.16 <0.04 <0.04 <0.04
Hexavalent chromium mg/ℓ 0.3 0.24 <0.04 <0.04 <0.04

Noise
(Noise Regulation Act, Prefectural Regulations and Agreements)

Automotive Business
Gunma Plant

Measurement Location Unit Regulation*
(Night)
Voluntary standard Measurement sites Measured value
​Main Plant dB (A) 55 54 20 37~54
Yajima Plant dB (A) 55 54 20 43~53
Oizumi Plant dB (A) 50 49 20 40~50

* Gunma prefectural regulations, and Ota-Oizumi pollution prevention agreements.

Aerospace Company
​Utsunomiya Plant

Measurement Location Unit Regulation
(Night)
Voluntary standard Measurement sites Maximum
​Main Plant dB (A) 60 58 8 58
South Plant dB (A) 50 48 3 38
2nd South Plant dB (A) 50 48 3 46

​Handa Plant

Measurement Location Unit Regulation
(Night)
Voluntary standard Measurement sites Maximum
​Handa Plant dB (A) 65 63 3 51

​​Handa West Plant

Measurement Location Unit Regulation
(Night)
Voluntary standard Measurement sites Maximum
​​Handa West Plant dB (A) 65 63 6 58

Vibration
(Vibration Regulation Act, Prefectural Regulations and Agreements)

Automotive Business
Gunma Plant

Measurement Location Unit Regulation
(Night)
Voluntary standard Measurement sites Measured value
​Main Plant dB (A) 65 64 20 18.5~38.2
Yajima Plant dB (A) 65 64 20 26.1~41.4
Oizumi Plant dB (A) 60 59 20 20.1~38.7

Aerospace Company
​Utsunomiya Plant

Measurement Location Unit Regulation
(Night)
Voluntary standard Measurement sites Maximum
​Main Plant dB (Z) 65 63 8 34
South Plant dB (Z) 60 58 2 Less than 30
2nd South Plant dB (Z) 60 58 3 Less than 30

Handa Plant and Handa West Plant

Measurement Location Unit Regulation
(Night)
Voluntary standard Measurement sites Maximum
​Handa Plant dB (Z) 70 68 3 Less than 30
​​Handa West Plant dB (Z) 70 68 5 Less than 30

Odor
(Offensive Odor Control Act)

Automotive Business
Gunma Plant

[Odor index]

Measurement Location Regulation Voluntary standard Measurement sites Measured value
​Main Plant 21 20 6 Less than 10
Yajima Plant 21 20 6 Less than 10

PRTR Substances Handled and Emitted
PRTR Substances:Japan’s Pollutant Release and Transfer Register (PRTR) Law.

Automotive Business
Gunma Plant (Main Plant, Yajima Plant, Oizumi Plant, Subaru Test & Development Center at Sano)

[Unit: kg/year (except for dioxins), dioxins: mg-TEQ/year]

Chemical substance Amount handled Atmospheric emissions Water emissions
(Public waters)
Amount moved
(Sewage)
Amount moved Amount consumed Amount removed through processing Amount recycled
Water soluble zinc compounds 184,364 0 1,600 0 0 182,764 0 0
Ethylbenzene 454,149 244,921 0 0 0 18,254 52,216 138,758
Xylene 732,121 337,354 0 0 0 182,700 120,503 91,564
1,2,4-Trimethylbenzene 253,174 1,321 0 0 0 241,678 10,175 0
1,3,5-Trimethylbenzene 39,083 21,339 0 0 0 2,413 8,443 6,887
Toluene 788,133 259,217 0 0 0 365,866 74,498 88,552
Naphthalene 12,802 8,453 0 0 0 0 3,010 1,339
Nickel compounds 8,449 0 228 0 3,995 4,226 0 0
Bis (2-ethylhexyl) phthalate 10,404 0 0 0 209 10,195 0 0
Hydrogen fluoride and its water-soluble salts 10,100 0 9,191 0 0 909 0 0
N-hexane 123,998 667 0 0 0 123,331 0 0
Benzene 22,108 126 0 0 0 21,982 0 0
Formaldehyde 19,214 9,801 0 0 1,995 0 4,259 3,159
Manganese and compounds 24,048 0 634 0 10,948 12,466 0 0
Dioxins
Unit: mg-TEQ/year
0 0.0547 0 0 0.000 0 0 0
Cumener 13,917 8,360 0 0 0 0 3,375 2,182
Methylnaphthalene 15,849 73 0 0 0 15,776 0 0
Total 2,711,912 891,632 11,653 0 17,147 1,182,560 276,479 332,441
903,285

Tokyo Office

【Unit: kg/year】

Chemical substance Amount handled Atmospheric emissions Water emissions
(Public waters)
Amount moved
(Sewage)
Amount moved Amount consumed Amount removed through processing Amount recycled
Ethylbenzene 15,839 0.17 0 0 0 15,839 0 0
Ethylene glycol 2,002 0.00 0 0 0 2,002 0 0
Xylene 70,788 0.67 0 0 0 70,787 0 0
1,3,5-Trimethylbenzene 11,326 0.03 0 0 0 11,326 0 0
Toluene 262,414 8.60 0 0 0 262,405 0 0
1,2,4-Trimethylbenzene 57,408 0.20 0 0 0 57,408 0 0
Benzene 8,684 1.01 0 0 0 8,683 0 0
n-Hexane 27,157 6.90 0 0 0 27,150 0 0
Total 455,618 17.58 0 0 0 455,600 0 0
17.58

Aerospace Company

[Unit: kg/year]

Chemical substance Amount handled Atmospheric emissions Water emissions
(Public waters)
Amount moved
(Sewage)
Amount moved Amount consumed Amount removed through processing Amount recycled
Bisphenol-A 2,656 0 0 0 1,062 1,594 0 0
Xylene 3,968 3,003 0 0 965 0 0 0
Hexavalent chromium compound 1,679 0 0 0 533 353 793 0
Toluene 24,989 19,500 0 0 5,489 0 0 0
Manganese and compounds 955 0 0 0 382 573 0 0
1,3-Dioxolan 4,480 3,494 0 0 986 0 0 0
Total 38,727 25,997 0 0 9,417 2,520 793 0