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Statistics about

Emissions to air

The statistic for emissions to air in Norway show human-caused emissions compiled by activity and emission component, occurring in Norwegian territory. The statistic for emissions to air from Norwegian economic activity show emissions compiled by industry and emission component, following the same principles and definitions as the national accounts.

Updated: 5 November 2024
Next update: 6 June 2025
Modified: Figures on the total, cold flaring and leakage, offshore are corrected for the period 1990 to 2023.

Selected figures from this statistics

  • Emissions to air
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    Emissions to air1
    Million tonnes CO₂ equivalents2 Change in per cent
    20231990 - 20232022 - 2023
    Emissions46.7-9.1-4.7
    Oil and gas extraction11.640.1-4.3
    Manufacturing industries and mining10.8-43.5-6.0
    Energy supply1.2263.9-16.9
    Heating in other industries and households0.6-76.812.7
    Road traffic8.07.9-7.9
    Aviation, navigation, motor equip. etc.3 7.644.1-0.4
    Agriculture4.5-10.5-4.0
    Other2.2-27.8-0.7
    1Figures published in June are preliminary. Final figures are published in November.
    2Greenhouse gas emissions expresses in CO₂-equivalents show how much warming effect a greenhouse gas has, converted to the amount of CO₂.
    3The data source on emissions from aviation is reviewed, and there may be changes in the results. Any corrections will not have a major impact on total emission figures.
    Figures on the total, cold flaring and leakage, offshore are corrected for the period 1990 to 2023 at 6 November 2024
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    Explanation of symbols
    Source
    StatBank source table 13931
  • Emissions to air of greenhouse gases. Million tonnes CO₂ equivalents
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    Emissions to air of greenhouse gases. Million tonnes CO₂ equivalents1
    Mill. tonnes CO₂ equivalents2
    Greenhouse gases totalCarbon dioxide (CO2)Methane (CH4)Nitrous oxide (N2O)Hydrofluorocarbons (HFK)Perfluorocarbons (PFK)Sulphurhexafluoride (SF6)
    199051.335.06.83.80.03.52.2
    200055.142.16.83.60.41.40.9
    200554.943.36.23.80.50.90.3
    201951.242.95.02.30.80.20.1
    202049.541.35.02.20.80.10.1
    202149.341.15.02.20.70.20.1
    202249.040.85.02.20.80.10.1
    202346.738.94.82.10.80.10.1
    1Does not include ocean transport and international air transport.
    2Greenhouse gas emissions expresses in CO₂-equivalents show how much warming effect a greenhouse gas has, converted to the amount of CO₂.
    Figures on the total, cold flaring and leakage, offshore are corrected for the period 1990 to 2023 at 6 November 2024
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    Explanation of symbols
    Source
    StatBank source table 13931
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About the statistics

The information under «About the statistics» was last updated 19 November 2024.

The national emission model includes four dimensions:

  • Pollutants: The different gases/substances covered by the emission model
  • Technical emission sources: Stoves, ships, vehicles, flares, biological and industrial processes
  • Industry: Standard Industrial Classification (NACE)
  • Commodity: Different energy commodities; solid fuels (for example coal and coke), liquid fuels (diesel oil, petrol, kerosene, heavy oil etc.), gases (natural gas, landfill gas etc.), biofuel (for instance fuel wood, wood waste, pellets) and waste (hazardous waste and other waste).

CO2 equivalents:

  • The various greenhouse gases cause atmospheric heating to different degrees. To have a consistent overview of the total effects from these gases, GWP (global warming potential) values are used. The GWP-value of a gas is defined as the greenhouse effect of one ton of the given gas compared to one ton of CO2. As a result, the unit we use to measure greenhouse gas emissions is called CO2-equivalents.

Substance and GWP value due to IPCC Fifth Assessment Report (AR5)

Component:

GWP-verdi AR5

Carbon dioxide (CO2)

1

Methan (CH4)

28

Nitrous oxide (N2O)

265

HFK-23

12 400

HFK-32

677

HFK-125

3 170

HFK-134

1 120

HFK-134a

1 300

HFK-143

328

HFK-143a

4 800

HFK-152a

138

HFK-227ea

3 350

PFK-14 (CF4)

6 630

PFK-116 (C2F6)

11 100

PFK-218 (C3F8)

8 900

Sulfur hexafluoride (SF6)

23 500

Acid equivalents

  • Other polluting gasses are measured together in relation to their overall polluting effect. NH3 for example is considered a polluting gas because biological processes in the soil convert basic NH3 to an acid, which has a range of negative effects. The following factors are used to convert different polluting gases to acid equivalents (Potential Acid Equivalents)
    • NOx * 1/46
    • SO2 * 1/32
    • NH3 * 1/17
  • International agreements consider each polluting gas separately, and not together as acid equivalents.

Ozone precursors

  • Ozone precursors are pollutants that cause the formation of ozone in the atmosphere, also known as ground-level ozone, which acts as a greenhouse gas. Some of the most significant ozone precursors are:
    • Non-methane volatile organic compounds (NMVOC)
    • Nitrogen oxides (NOx)
    • Carbon monoxide (CO)

Environmental toxins

  • Environmental toxins are a group of various organic and inorganic substances that are resistant to decomposition (persistent), and which both accumulate and have toxic effects in living organisms.

Heavy metals:

  • Lead (Pb)
  • Cadmium (Cd)
  • Mercury (Hg)
  • Copper (Cu)
  • Chrome (Cr)

Other elements

  • Arsenic (As)

POPs (Persistent Organic Pollutants)

  • Polycyclic aromatic hydrocarbons (PAHs)
  • Dioxins

Particulate matter

  • TSP – total particulate matter (Total Suspended Particulates)
  • PM10 - Particulate matter with a diameter of less than 10 micrometers
  • PM2,5 - Particulate matter with a diameter of less than 2,5 micrometers

Standard Classifications in the published tables:

Classification of sources for emissions to air, national figures

Classification of substances emitted to air

Classification of Variant of SIC - Environmental accounts

Emissions to air from Norwegian economic activity has been revised for the industry classification 2007, which has been valid since 1. January 2009.

Standard Classifications in the reported tables:

NAMEA (NACE according to Quarterly National Accounts)

CRF - tables to UNFCCC

NFR - tables to UNECE

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