Air emissions

Greenhouse gas (GHG) emissions

In addition to direct CO2 emissions, Wärtsilä’s operations generate indirect CO2 emissions. In 2020, the calculated secondary CO2 e emissions (location-based method) were 34,561 tons (40,911) (from purchased electricity and heat) and the CO2 e emissions from flights totalled 11,191 tons (34,700). There were no biogenic CO2 emissions in 2020.

GHG emissions 2020 2019 2018 2017 2016
Direct (Scope 1) (tCO2 e)   52,911 56,568 59,949 57,998 57,355
Indirect (Scope 2) (tCO2 e)  34,561 40,911
47,347 56,002 59,697
Other indirect (Scope 3) (tCO2 e)   107,923 164,550
208,330 155,537* 168,571
GHG emissions intensity (all)  42.6 50.8
61.5 56.1 60.8

Reduction of greenhouse gas (GHG) emissions

Wärtsilä has taken several measures to reduce its indirect CO2 emissions. The energy efficiency commitment aims to reduce energy consumption and emissions. In addition, Wärtsilä’s focus lies on reducing travelling by implementing a strict travel policy and by using virtual meeting concepts: Teams instant messaging, which enables live chats between two or more people, and Teams meetings, allowing multiple people to interact and share presentation material from personal computers, with a video conferencing option. In Wärtsilä, Teams meetings and video conferences are in everyday use. Approximately 5,500 Teams conferences are arranged daily. A traditional video conference system exists in 160 rooms in 49 countries, and as a new expanding solution, there are 130 Teams rooms in a few countries. In 2020, emissions from business flights were reduced by 68%, or 23,500 tons CO2 e compared to the previous year, mainly due to the COVID-19 pandemic.

NOx, SOx and other significant emissions.

Air emissions are mainly caused by test runs and the painting of completed engines or other Wärtsilä products. Test run emissions consist of nitrogen oxides (NOx ), sulphur dioxide (SOx ), carbon dioxides (CO2 ) and particles, as well as small amounts of other emission components. The painting of engines and other Wärtsilä products generates VOC emissions (volatile organic compounds). Engine emissions are reduced through research and development, as well as product development and testing. These measures also generate emissions, but their results reduce the future emissions of manufactured engines.

The primary sources of manufacturing noise are the engine test runs and the ventilation machinery on factory roofs. This noise is mostly low frequency and is therefore not easily detected by the human ear. Wärtsilä has specifically addressed the issue of noise protection using technical means and has succeeded in lowering noise levels considerably. However, noise abatement is a continuous need and requires regular monitoring.

Emissions 2020 2019 2018 2017 2016
  Nitrogen oxides (t)  445 544 545  534 500
Sulphur oxides (t)  47 51 55 62 59
Total hydrocarbons (t)  147 139 164 131 116
Particulates (t)  6 7 7 8 9
VOC (t)  31 37 45 36 30


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