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FYE March 2023 Environmental Performance Data for Plants and Offices

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In addition to complying with the laws and regulations, SUBARU sets voluntary standards that are 20% stricter than the legal regulation values to manage the controlled substances.
The following shows the regulation values and measured performance data for our plants and offices regarding the main substances.

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 52 43
Particulate matter g/Nm3 0.2 0.16 0.008 0.003
VOC Paint booth, etc. ppm-C 700 - 568 81
Yajima Plant
Substance Equipment / Facility Unit Regulation Voluntary Standard Maximum Average
NOx Paint drying oven ppm 230 184 63 50
Particulate matter g/Nm3 0.2 0.16 0.004 0.003
VOC Paint booth, etc. ppm-C 700 - 351 68
VOC ppm-C 400 - 329 68
Oizumi Plant
Substance Equipment / Facility Unit Regulation Voluntary Standard Maximum Average
NOx Aluminum melting furnace ppm 180 144 81 41
Particulate matter g/Nm3 0.3 0.24 0.004 0.007
Ota North Plant

No applicable equipment / facility

Tokyo Office

No applicable equipment / facility

Aerospace Company

Utsunomiya Plant

Main Plant
Substance Equipment / Facility Unit Regulation Voluntary Standard Maximum Average
NOx Cogeneration ppm 600 480 112 108
NOx Drying oven ppm 230 184 < 100 < 100
Particulate matter g/Nm3 0.2 0.16 < 0.010 < 0.010
South Plant and 2nd South Plant

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 ppm 180 144 37 30
Particulate matter 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 ppm 180 144 40 28
Particulate matter 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 (Effluent is discharged into public rivers.)
Item Unit Regulation
(Prefectural Regulation)		 Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.1～8.3 7.6 7.0 7.4
Biochemical oxygen demand (BOD) mg/L 25 20 4.2 1.1 2.5
Suspended solids (SS) mg/L 50 40 2.4 < 1.0 1
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 < 1.0 < 1.0 < 1.0
n-Hexane extract content
(Animal and plant oil and fat content)		 mg/L 30 24 < 1.0 < 1.0 < 1.0
Fluorine and its compounds mg/L 8 6.4 2.8 < 0.2 1.0
Zinc content mg/L 2 1.6 0.445 0.016 0.150
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 3.7 0.1 1.4
Nitrogen content mg/L 120 (60) 48 6.3 2.1 4.6

Measured 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 (Effluent is discharged into public rivers.)
Item Unit Regulation
(Prefectural Regulation)		 Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.1～8.3 7.6 7.1 7.3
Biochemical oxygen demand (BOD) mg/L 25 20 9.7 2.7 5.6
Suspended solids (SS) mg/L 50 40 1.6 < 1.0 1.9
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 < 1.0 < 1.0 < 1.0
n-Hexane extract content
(Animal and plant oil and fat content)		 mg/L 30 24 < 1.0 < 1.0 < 1.0
Fluorine and its compounds mg/L 8 6.4 2.3 1.4 1.8
Zinc content mg/L 2 1.6 0.785 0.312 0.605
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 0.7 0.4 0.6
Nitrogen content mg/L 120 (60) 48 6.0 4.1 4.7

Values for total phosphorus content and total nitrogen content are daily averages.

Oizumi Plant (Effluent is discharged into public rivers.)
Item Unit Regulation
(Prefectural Regulation)		 Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.1～8.3 7.5 7.0 7.2
Biochemical oxygen demand (BOD) mg/L 10 8 4.5 < 1.0 3.2
Suspended solids (SS) mg/L 10 8 3.2 < 1.0 1.6
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 oil and fat 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 0.304 0.097 0.176
Soluble iron content mg/L 5 4 0.2 < 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 0.4 < 0.1 0.3
Nitrogen content mg/L 120 (60) 48 14.8 5.4 10.5

Values for total phosphorus content and total nitrogen content are daily averages.

Ota North Plant (Effluent is discharged into public rivers.)
Item Unit Regulation
(Prefectural Regulation)		 Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.1～8.3 7.7 7.7 7.7
Biochemical oxygen demand (BOD) mg/L 25 20 1.8 < 1.0 1.4
Suspended solids (SS) mg/L 50 40 1.6 < 1.0 1.3
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 < 1.0 < 1.0 < 1.0
n-Hexane extract content
(Animal and plant oil and fat 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 0.016 0.013 0.015
Soluble iron content mg/L 10 8 < 0.1 < 0.1 < 0.1
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 1.1 1.1 1.1

Values for total phosphorus content and total nitrogen content are daily averages.

Tokyo Office (Discharged into sewage.)

Item Unit Regulation* Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.0～9.0 5.4～8.6 8.8 8.0 8.5
Biochemical oxygen demand (BOD) mg/L 600 480 270 13 158
Suspended solids (SS) mg/L 600 480 350 37 168
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 0 0 0
n-Hexane extract content
(Animal and plant oil and fat content)		 mg/L 30 24 31 1 7
Total phosphorus mg/L 16 12.8 6 3 4
Total nitrogen mg/L 120 96 140 6 66
Soluble manganese mg/L 10 8 0.02 0.02 0.02
Cyanogen mg/L 1 0.8 0 0 0
*
Our regular water quality analysis revealed n-Hexane extract content (animal and plant oil and fat content) and total nitrogen levels that exceeded the exclusion criteria of the city’s sewage ordinance, as well as the voluntary criteria for pH. We are conducting a root cause analysis of the issue, including investigating necessary water discharge amounts and water inflow, and will explore and implement measures to rectify the situation.

Aerospace Company

Utsunomiya Plant

Main Plant (Discharged into sewage.)
Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5～9 5.4～8.6 8.3 6.9 7.6
Suspended solids (SS) mg/L 600 480 367 1.0 65
Biochemical oxygen demand (BOD) mg/L 600 480 455 0.5 73
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 < 1.0 < 1.0 < 1.0
n-Hexane extract content
(Animal and plant oil and fat content)		 mg/L 30 24 10.1 1.0 2.5
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 0.004 < 0.003 < 0.003
Total chromium mg/L 2 1.6 0.47 < 0.01 0.04
Hexavalent chromium mg/L 0.1 0.08 < 0.02 < 0.02 < 0.02
Main Plant (Effluent is discharged into public rivers.)
Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.0～8.3 8.2 7.0 7.7
Suspended solids (SS) mg/L 50 40 1.2 1.0 1.1
Biochemical oxygen demand (BOD) mg/L 30 24 20.6 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 oil and fat 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 < 0.03 < 0.03 < 0.03
Total chromium mg/L 2 1.6 < 0.01 < 0.01 < 0.01
Hexavalent chromium mg/L 0.5 0.4 < 0.0 < 0.0 < 0.0
South Plant (Discharged into sewage.)
Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5～9 5.4～8.6 8.5 6.9 7.5
Suspended solids (SS) mg/L 600 480 253 2.4 79
Biochemical oxygen demand (BOD) mg/L 600 480 420 3 125
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 < 1.0 < 1.0 < 1.0
n-Hexane extract content
(Animal and plant oil and fat content)		 mg/L 30 24 9.6 < 1.0 3.3
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
South Plant (Effluent is discharged into public rivers.)
Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.0～8.3 7.9 6.9 7.4
Suspended solids (SS) mg/L 50 40 2 1.0 1.5
Biochemical oxygen demand (BOD) mg/L 30 24 14 0.5 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 < 0.0 < 0.0 < 0.0
2nd South Plant (Discharged into sewage.)
Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5～9 5.4～8.6 8.6 6.9 7.7
Suspended solids (SS) mg/L 600 480 253 2 37
Biochemical oxygen demand (BOD) mg/L 600 480 256 2 43
n-Hexane extract content
(Mineral oil content)		 mg/L 5 4 < 1.0 < 1.0 < 1.0
n-Hexane extract content
(Animal and plant oil and fat content)		 mg/L 30 24 5.3 < 1.0 1.6
Fluorine compounds mg/L 8 6.4 5.5 0.2 0.4
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 0.62 0.02 0.06
Hexavalent chromium mg/L 0.1 0.08 < 0.02 < 0.02 < 0.02
2nd South Plant (Effluent is discharged into public rivers.)
Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.0～8.3 7.5 6.5 7.1
Suspended solids (SS) mg/L 50 40 < 1.0 < 1.0 < 1.0
Biochemical oxygen demand (BOD) mg/L 30 24 5.1 0.5 1.4
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 < 0.0 < 0.0 < 0.0

Handa Plant (Effluent is discharged into public rivers.)

Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5～9 5.8～8.3 8.2 5.9 6.9
Suspended solids (SS) mg/L 30 24 9.0 1.0 1.6
Biochemical oxygen demand (BOD) mg/L 25 20 18.0 0.5 3.6
Chemical oxygen demand (COD) mg/L 25 20 13.0 1.5 4.8
n-Hexane extract content
(Mineral oil content)		 mg/L 2 1.6 < 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 (Effluent is discharged into public rivers.)

Item Unit Regulation Voluntary Standard Maximum Minimum Average
Hydrogen ion concentration (pH) - 5.8～8.6 6.0～8.3 7.7 7.2 7.4
Suspended solids (SS) mg/L 30 24 6.0 1.0 2.8
Biochemical oxygen demand (BOD) mg/L 25 20 14.0 1.1 4.6
Chemical oxygen demand (COD) mg/L 25 20 7.5 1.4 4.1
n-Hexane extract content
(Mineral oil content)		 mg/L 2 1.6 < 0.5 < 0.5 < 0.5
Cyanogen mg/L 0.5 0.5 < 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 0.3 0.3 < 0.04 < 0.04 < 0.04

Noise (Noise Regulation Act, Prefectural Regulations, Agreements)

Automotive Business

Gunma Plant

Measurement Location Unit Regulation*
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Main Plant dB(A) 55 54 16 53
Yajima Plant dB(A) 55 54 20 48～49
Oizumi Plant dB(A) 50 49 20 47～49
*
The Oizumi Plant exceeded regulatory levels due to intermittent noise. We have confirmed that this intermittent noise is no longer occurring.

Aerospace Company

Utsunomiya Plant

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Main Plant dB(A) 60 58 8 49
South Plant dB(A) 50 48 3 42
2nd South Plant dB(A) 50 48 3 39

Handa Plant

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Handa Plant dB(A) 65 63 3 47

Handa West Plant

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Handa West Plant dB(A) 65 63 6 42

Kisarazu Office

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Kisarazu Office dB(Z) 50 48 2 36

Vibration (Vibration Regulation Act, Prefectural Regulations, Agreements)

Automotive Business

Gunma Plant

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Main Plant dB(A) 65 64 16 37～39
Yajima Plant dB(A) 65 64 20 43～45
Oizumi Plant dB(A) 60 59 20 34～38

Aerospace Company

Utsunomiya Plant

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Main Plant dB(Z) 65 63 8 32
South Plant dB(Z) 60 58 2 <30
2nd South Plant dB(Z) 60 58 3 <30

Handa Plant and Handa West Plant

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Handa Plant dB(Z) 70 68 3 <30
Handa West Plant dB(Z) 70 68 5 <30

Kisarazu Office

Measurement Location Unit Regulation
(Night)		 Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Kisarazu Office dB(Z) 55 53 2 <30

Odor (Offensive Odor Control Act)

Automotive Business

Gunma Plant

Measurement Location Regulation Voluntary
Standard		 Number of
Measurement Sites		 Maximum
Main Plant 21 20 6 <10
Yajima Plant 21 20 8 <10
Oizumi Plant 21 20 6 <10

[Odor index]

Chemical Substances Subject to Japan’s Pollutant Release and Transfer Register (PRTR) System: Amount Handled and Emissions

Automotive Business

Gunma Plant (Main Plant, Yajima Plant, Oizumi Plant, Subaru Test & Development Center (SKC))

Chemical Substance Amount Handled Emissions Amount Transferred Amount Consumed Amount Removed through Processing Amount Recycled
Atmosphere Water Sewer Waste
Water-soluble zinc compounds 12,628 0 139 0 0 10,103 0 0
Ethylbenzene 423,530 230,412 0 0 0 37,587 55,834 99,696
Xylene 515,106 213,499 0 0 0 158,430 58,031 85,146
1,2,4-Trimethylbenzene 257,969 896 0 0 0 180,461 28,249 95,130
1,3,5-Trimethylbenzene 27,670 15,921 0 0 0 1,260 6,305 4,184
Toluene 658,465 218,330 0 0 0 318,442 76,150 45,561
Naphthalene 8,927 6,149 0 0 0 112,648 29,747 1,206
Nickel compounds 764 0 21 0 362 382 0 0
Bis(2-ethylhexyl) phthalate 6,381 0 0 0 128 6,254 0 0
Hydrogen fluoride and its water-soluble salts 7,580 0 6,898 0 0 682 0 0
n-Hexane 111,314 377 0 0 0 110,938 0 0
Benzene 19,669 67 0 0 0 19,602 0 0
Formaldehyde 11,265 5,926 0 0 1,221 0 3,114 1,523
Manganese and its compounds 5,015 0 133 0 0 2,548 0 0
Dioxins
Unit: mg-TEQ/year		 0 0 0 0 0 0 0 0
Cumene 1,009 655 0 0 0 0 167 187
Methylnaphthalene 8,127 41 0 0 0 8,086 0 0
Total 2,075,421 692,273 7,190 0 1,710 967,422 257,597 332,633
699,463

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

Tokyo Office

Chemical Substance Amount Handled Emissions Amount Transferred Amount Consumed Amount Removed through Processing Amount Recycled
Atmosphere Water Sewer Waste
Ethylbenzene 11,312 0.11 0 0 311.8 0 0 0
Xylene 49,320 0.45 0 0 1,351 0 0 0
1.3.5-Trimethylbenzene 6,814 0.02 0 0 311.8 0 0 0
Toluene 174,610 5.39 0 0 6,235.2 0 0 0
1.2.4-Trimethylbenzene 36,696 0.12 0 0 1,117.1 0 0 0
Benzene 6,421 0.71 0 0 155.9 0 0 0
n-Hexane 22,862 5.53 0 0 259.8 0 0 0
Total 308,035 12.33 0 0 9,743 0 0 0
12.33

[Unit: kg/year]

Aerospace Company

Chemical Substance Amount Handled Emissions Amount Transferred Amount Consumed Amount Removed through Processing Amount Recycled
Atmosphere Water Sewer Waste
Toluene 21,683 7,786 0 0 2,206 11,689 0 0
Xylene 2,075 494 0 0 163 1,418 0 0
Hexavalent chromium, manganese, and ethylbenzene are not listed because they are handled in quantities of less than one ton.
Total 23,758 8,280 0 0 2,369 13,107 0 0

[Unit: kg/year]

Sustainability&CSR > Environment

Environmental Management
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Climate Change
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Prevention of Pollution
FYE March 2023 Environmental Performance Data for Plants and Offices