This section includes indicators and GRI Standard disclosures.

Our environmental data covers our 11 largest manufacturing sites, representing more than 95% of the overall environmental impact of the Company.

The methodologies used to calculate data are detailed in internal Company procedures, which are regularly reviewed during third-party environmental audits (EMAS, ISO 14001, ISO 50001, ISO 14064).

See ST site certifications table in business indicators.

ST follows the Greenhouse Gas (GHG) Protocol for managing its GHG emissions. The resulting CO₂ emissions are reported according to recognized international standards (Reference – World Resources Institute (2004) GHG Protocol – A Corporate Accounting and Reporting Standard).

Scope 1 – Direct emissions resulting from operations

• Combustion emissions: World Resources Institute (2008) – GHG Protocol Calculation tool for stationary combustion v.4.1
• PFC emissions: 2007 IPCC fourth Assessment Report Climate Change. Table 2.14. Lifetimes, radiative efficiencies and direct GWPs relative to CO₂ www.ipcc.ch

Scope 2 – Indirect emissions resulting from purchased electricity

• World Resources Institute (2014). GHG Protocol tool for stationary combustion. Version 4.8, GHG Protocol Scope 2 Guidance

Scope 3 – Emissions resulting from travel and transportation

• Mobile Combustion GHG Protocol tool v.2.6
• Supplement to the Corporate Value Chain (Scope 3) accounting and reporting standard

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Summary of net CO₂ emissions (KTons) I 305-1 I 305-2 I 305-3 I SDG 13.1

	2017	2018	2019	2020	2021
Direct emissions Scope 1	605	644	557	486	481
Indirect emissions (purchased electricity) Scope 2(1)	756	791	702	564	473
Other indirect emissions (transportation(2)) Scope 3	132	137	143	86	90
Total emissions	1,493	1,573	1,402	1,137	1,044
(1) Market-based method calculation according to GHG Protocol standard. (2) The transportation emissions value is a global estimate of employee transportation and transportation of goods.

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Environmental burden – net values SDG 3.9 - SDG 6.3

	2017	2018	2019	2020	2021
Emissions to air
Global warming(1) (MTCE)	407,290	428,912	382,277	310,041	284,726
Ozone depletion (kg R11 Eq)	0.00	0.00	0.00	0.00	0.00
VOCs (tons)	287	297	139	148	193
Atmospheric acidification (Kg SO2 Eq)	36,084	43,856	46,018	51,207	62,178
Photochemical oxidant creation (Kg ethylene Eq)	49,166	43,749	35,799	38,295	49,548
Air emission toxicity(2) Kg PH3 Eq	1,595	2,240	1,414	3,192	3,717
Emissions to water(3)
Eutrophication (Kg (P+N))	176,555	164,027	169,575	126,286	184,147
Aquatic oxygen demand (Kg COD(4))	595,257	605,100	632,625	656,045	1,213,093
Heavy metals to water (Kg heavy metals)	11,560	14,222	9,233	6,880	9,162
Aquatic ecotoxicity (Kg Cu Eq)	6,208	5,764	5,211	4,290	5,033
(1) Includes direct Greenhouse gas (GHG) emissions from our manufacturing plants and indirect emissions from energy consumption and transport, reported in Metric Tons of Carbon Equivalent (MTCE). Does not include GHG emissions from subcontractors and foundries. (2) Emissions of substances are considered only if they exceed the minimum threshold of 3ppm, expressed in phosphine equivalent. For Volatile Organic Compounds, Atmospheric acidification, Photochemical Oxidant Creation and Air emission toxicity, the particulate matter is not covered. (3) Domestic wastewater is included. (4) Total Chemical Oxygen Demand (COD).

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Consumption of energy I 302-3 I SDG 7.3
Per unit of production – normalized values

	2017	2018	2019	2020	2021
Consumption of energy	88	81	86	99	81
Baseline 100 in 2016.

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Water withdrawal by source (1,000m³)⁽¹⁾ I 303-3 I SDG 6.4

	2017	2018	2019	2020	2021
Groundwater	3,055	4,236	3,029	2,880	2,747
Surface water	-	0	0	0	0
Municipal water supplies	14,009	13,967	15,814	17,342	18,698
Total withdrawal	17,064	18,204	18,843	20,223	21,445
(1) The sums may not add up due to rounding of the figures

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Recycled and reused total water I 303-5 I SDG 6.3 - SDG 6.4

	2017	2018	2019	2020	2021
Ultrapure water used (1,000m3)	-	-	11,243	12,331	13,194
Total water used (1,000m3)	29,920	30,654	31,708	34,055	35,888
Total volume of water recycled and reused (1,000m3)	12,857	12,450	12,870	13,833	14,445
Water recycled and reused (%)	43.0%	40.6%	40.6%	40.6%	40.3%

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Waste in tons I 306-2 I SDG 12.4

	2017	2018	2019	2020	2021
Total hazardous waste	14,361	16,483	16,877	19,605	22,568
Total waste	39,615	44,828	43,593	49,012	55,672

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Hazardous waste split (%) I 306-2 I SDG 12.4

	2017	2018	2019	2020	2021
Reuse	4.1	3.1	3.1	3.5	2.7
Sent for recycling	62.7	71.8	70.9	68.0	66.1
Recovery(1)	18.5	18.3	20.0	23.8	27.5
Incineration	12.2	4.8	3.9	2.7	2.1
Landfill	2.5	2.0	2.1	2.0	1.7
(1) Waste burnt with recovery of energy (combustion).

WEEE

As a supplier of components to the electronics industry (and not a manufacturer of electronic equipment), our silicon products are not directly affected by the European Directive 2012/19/ EU Waste of Electrical and Electronic Equipment (WEEE). However, since 2018, demonstration and evaluation boards supplied by ST are subject to the Directive.

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Consumption of chemicals SDG 12.4
Per unit of production – normalized values

	2017	2018	2019	2020	2021
Consumption of chemicals	97	100	98	101	96
Baseline 100 in 2016.

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Elimination of Substances of Very High Concern (SVHC) SDG 12.4

	2017	2018	2019	2020	2021
Total number of action plans(1) completed since 2008	23	23	23	23	24
(1) One substance can be subject to several action plans to be eliminated from different ST processes.

Spills in 2021 | 306-3 |

None

Fines and non-monetary sanctions in 2021

Ang Mo Kio (Singapore): $400 paid for mosquito breeding offences according to the Control of Vectors and Pesticides Act, 1998.
Toa Payoh (Singapore): $200 paid for mosquito breeding offences according to the Control of Vectors and Pesticides Act, 1998.