Which Impact Assessment Categories are supported?
One Click LCA supports all the 24 impact categories listed in EN 15804 based on CML methodology and 6 impact categories according to the TRACI methodology. However, the impact categories offered for each of the calculation tools depend on the purpose of the tool. For instance, the calculation tool for the Material 01 credit in BREEAM International only shows the six impact categories required for this credit.
For all the tools targeting for European markets, the impact assessment methodology is CML –IA 2012, which is the methodology required by the European EN 15978 and EN 15804 standards. The CML methodology was created by the University of Leiden in the Netherlands in 2001.
For North American markets we use TRACI, short for “Tool for the Reduction and Assessment of Chemical and Other Environmental Impacts”, which was developed by the U.S. Environmental Protection Agency.
Standard impact categories and units (CML/EN/TRACI)
Global warming potential (GWP): Global warming potential is a relative measure of how much heat a greenhouse gas traps in the atmosphere. The global warming potential is calculated in carbon dioxide equivalents meaning that the greenhouse potential of emission is given in relation to CO2. Since the residence time of gases in the atmosphere is incorporated into the calculation, a time range for the assessment is defined to be 100 years.
- For the CML methodology the unit kgCO2-Eq is used.
- For the TRACI methodology the unit kgCO2-Eq/kg substance is used.
Ozone depletion potential (ODP): Ozone depletion potential represents a relative value that indicates the potential of a substance to destroy ozone gas as compared with the potential of chlorofluorocarbon-11 which is assigned a reference value of 1, resulting in an equilibrium state of total ozone reduction.
- For the CML methodology the unit kgCFC-11-Eq is used.
- For the TRACI methodology the unit kgCFC-11-Eq/kg substance is used.
Acidification potential (AP): The acidification of soils and waters occurs predominantly through the transformation of air pollutants into acids, which leads to a decrease in the pH-value of rainwater and fog from 5.6 and below. Acidification potential is described as the ability of certain substances to build and release H+ions and is given in sulphur dioxide equivalents.
- For the CML methodology the unit kgSO2-Eq is used.
- For the TRACI methodology the unit kgSO2-Eq/kg substance is used.
Eutrophication potential (EP): Eutrophication is the enrichment of nutrients in a certain place. It can be aquatic or terrestrial. All emissions of N and P to air, water and soil and of organic matter to water are aggregated into a single measure.
- For the CML methodology the unit kgPO4-Eq is used.
- For the TRACI methodology the unit kgN-Eq/kg substance is used.
Photochemical ozone creation potential (POCP)/ Smog formation: Radiation from the sun produces aggressive reaction products, like ozone, in the presence of nitrogen oxides and hydrocarbons.
In the CML methodology this is called Photochemical ozone creation potential (POCP).
- For the CML methodology the unit kgC2H4-Eq (ethylene-equivalents) is used.
In the TRACI methodology this is called Smog formation.
- For the TRACI methodology the unit kgO3Eq/kg substance is used.
Abiotic depletion potential (ADP)/ Fossil fuel depletion: Abiotic depletion describes the reduction of the global amount of non-renewable raw materials and is determined for each extraction of minerals and fossil fuels based on the remaining reserves and rate of extraction.
- For the CML methodology the unit Antimony kg Sb-eq or in MJ is used.
- For the TRACI methodology the unit MJ is used, which includes the fossil energy carriers (crude oil, natural gas, coal resources).
Additional TRACI indicators
Used in TRACI methodology only, these focus on covering those chemicals of concern within the US (e.g., TRI chemicals). It has since been recognized that today’s global economy often requires the inclusion of suppliers who are outside of the US within countries who may have their own lists of reportable chemicals. Additional indicators are:
- Human health cancer (CTUcancer/kg)
- Human health noncancer (CTUnoncancer/kg)
- Human health criteria pollutants
- Eco-toxicity (CTUeco/kg)
The USEtox expanded set allows this expansion into chemicals of concern globally. USEtox is developed with two spatial scales: continental and global. The environmental compartments within the continental scale include urban air, rural air, agricultural soil, industrial soil, freshwater, and coastal marine water. USEtox includes most of the pathways found in the original EPA Risk Assessment Guidelines, including inhalation, ingestion of drinking water, produce, meat, milk, and freshwater and marine fish.
The recommended units for the USEtox human health cancer, noncancer, and ecotoxicity are CTUcancer/kg, CTUnoncancer/kg, and CTUeco/kg, respectively. Read more here.
Other EN standard impact categories included in One Click LCA
- Use of renewable primary energy excluding renewable primary energy resources used as raw materials (MJ net calorific value)
- Use of renewable primary energy resources used as raw materials (MJ net calorific value)
- Total use of renewable primary energy resources (primary energy and primary energy resources used as materials) (MJ net calorific value)
- Use of non-renewable primary energy excluding non-renewable primary energy resources used as raw materials (MJ net calorific value)
- Use of non-renewable primary energy resources used as raw materials (MJ net calorific value)
- Total use of non-renewable primary energy resources (primary energy and primary energy resources used as materials) (MJ net calorific value)
- Use of secondary material (kg)
- Use of renewable secondary fuels (MJ net calorific value)
- Use of non-renewable secondary fuels (MJ net calorific value)
- Net use of freshwater (m3)
- Hazardous waste disposed of* (kg)
- Non-hazardous waste disposed of (kg)
- Radioactive waste disposed of (kg)
- Components for re-use (kg)
- Materials for recycling (kg)
- Materials for energy recovery (kg)
- Exported energy (MJ per energy carrier)