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EPD impact assessment categories are the environmental issues an Environmental Product Declaration (EPD) reports, while indicators are the calculated values that express each issue in a defined unit. For construction products using EN 15804+A2, the core set covers climate change, ozone depletion, acidification, three forms of eutrophication, photochemical ozone formation, resource depletion and water deprivation. To interpret any number correctly, read the category, indicator name, unit, life-cycle modules, product-category rules (PCR) and method version together.
What is the difference between an EPD impact category and an indicator?
An impact category names an environmental issue, such as climate change or acidification. An impact indicator is the quantified expression produced by applying characterization factors to the life-cycle inventory (LCI)—the recorded inputs and outputs of the product system. For example, acidification is the category; acidification potential, reported in moles of hydrogen-ion equivalent (mol H+ eq.), is its indicator.
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The calculation is part of life-cycle impact assessment (LCIA). Inventory flows such as emissions, energy use, extraction and water consumption are converted into common equivalents so that different substances contributing to the same issue can be represented in one result. These are potential-impact results. They are not direct measurements of damage at a particular site, proof that a legal limit has been exceeded, or a complete human-health or ecological risk assessment.
This distinction matters when an EPD displays several rows that appear to describe the same subject. Under EN 15804+A2, climate change is one category with separate indicators for fossil, biogenic and land-use/land-use-change contributions, plus a total. The indicator name and unit tell you which result you are looking at.
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Which impact assessment categories are reported in an EN 15804+A2 construction EPD?
The following core indicators come from the EN 15804:2012+A2:2019/AC:2021 corrigendum. A product’s applicable PCR can add requirements or additional indicators, so the EPD’s declared rule set always takes precedence. The corrected freshwater eutrophication unit is particularly important when checking older tables.
| Impact category | Indicator and abbreviation | Unit | What the result represents |
|---|---|---|---|
| Climate change – total | Global Warming Potential total (GWP-total) | kg CO2 eq. | Total reported warming potential, subject to the standard’s accounting provisions. |
| Climate change – fossil | Global Warming Potential fossil fuels (GWP-fossil) | kg CO2 eq. | Contribution associated with fossil sources. |
| Climate change – biogenic | Global Warming Potential biogenic (GWP-biogenic) | kg CO2 eq. | Contribution associated with biogenic carbon flows. |
| Climate change – land use and land-use change | Global Warming Potential land use and land-use change (GWP-luluc) | kg CO2 eq. | Effects associated with direct land-use change and related flows. |
| Ozone depletion | Depletion potential of the stratospheric ozone layer (ODP) | kg CFC-11 eq. | Potential contribution to stratospheric ozone depletion. |
| Acidification | Acidification potential, Accumulated Exceedance (AP) | mol H+ eq. | Potential contribution to acidifying deposition or exceedance. |
| Eutrophication, aquatic freshwater | Fraction of nutrients reaching freshwater end compartment (EP-freshwater) | kg P eq. | Potential nutrient enrichment of freshwater systems. |
| Eutrophication, aquatic marine | Fraction of nutrients reaching marine end compartment (EP-marine) | kg N eq. | Potential nutrient enrichment of marine systems. |
| Eutrophication, terrestrial | Accumulated Exceedance (EP-terrestrial) | mol N eq. | Potential nutrient-related exceedance on terrestrial ecosystems. |
| Photochemical ozone formation | Formation potential of tropospheric ozone (POCP) | kg NMVOC eq. | Potential formation of ground-level (tropospheric) ozone. |
| Abiotic resource depletion – minerals and metals | Abiotic depletion potential for non-fossil resources (ADP-minerals&metals) | kg Sb eq. | Potential depletion of non-fossil mineral and metal resources. |
| Abiotic resource depletion – fossil fuels | Abiotic depletion potential for fossil resources (ADP-fossil) | MJ, net calorific value | Potential depletion of fossil energy resources. |
| Water use | Water (user) deprivation potential (WDP), deprivation-weighted water consumption | m3 world eq. deprived | Potential deprivation linked to consumption in locations with differing water availability. |
The complete indicator names and corrected units are reproduced in the EN 15804+A2 corrigendum. The DAPHabitat Basic Module PCR version 3.1.1 independently lists this core set and notes that a PCR may require additional indicators, such as particulate matter or toxicity.
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How should I read the four climate-change indicators?
Do not treat the four climate rows as four unrelated environmental categories. They are separate reporting views of the climate-change category: GWP-fossil, GWP-biogenic and GWP-luluc, alongside GWP-total.
- GWP-fossil covers greenhouse-gas emissions and removals associated with fossil sources.
- GWP-biogenic reports the biogenic-carbon contribution under the standard’s accounting rules. A negative value in a particular module does not automatically mean the product has a net, permanent climate benefit across its whole life cycle.
- GWP-luluc isolates direct land-use and land-use-change effects where the method and data support them.
- GWP-total is the total reported climate indicator formed from the sub-indicators, subject to EN 15804+A2 reporting provisions.
EPD International’s GPI 5 indicator guidance stresses that fossil, biogenic and direct land-use-change accounting must be interpreted with the applicable PCR. Database choices, allocation rules and biogenic-carbon assumptions can materially affect the result, so compare like-for-like methods rather than selecting whichever climate row looks most favourable.
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Why are there three eutrophication categories?
Eutrophication is split by the environmental compartment receiving nutrients: freshwater, marine and terrestrial. Each compartment uses a different indicator and reference substance, so the numbers are not interchangeable.
EP-freshwater is reported in kilograms of phosphorus equivalent (kg P eq.). The 2021 corrigendum corrected this unit; older documents may show a different unit, which is a reason to verify the edition before transcribing a result. EP-marine uses kilograms of nitrogen equivalent (kg N eq.), while EP-terrestrial uses moles of nitrogen equivalent (mol N eq.) with an accumulated-exceedance approach. A single “eutrophication score” that combines these rows without a declared method would hide the distinctions the standard requires.
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Ozone depletion (ODP) expresses potential damage to the stratospheric ozone layer in kilograms of CFC-11 equivalent. It is different from photochemical ozone formation (POCP), which concerns ground-level ozone formed through atmospheric reactions and is reported in kilograms of non-methane volatile organic compound equivalent (kg NMVOC eq.). The word “ozone” therefore appears in two categories that describe different atmospheric problems.
Acidification potential (AP) uses accumulated exceedance and is reported in mol H+ equivalent. It represents a modeled potential contribution to acidifying effects, not a measurement of the pH of a particular lake, soil or building site. The characterization model and geographic assumptions in the PCR determine how inventory emissions become the AP value.
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How do resource-depletion and water indicators differ from simple consumption figures?
ADP-minerals&metals and ADP-fossil describe potential depletion of non-fossil and fossil resources, respectively. Their units differ—kg antimony equivalent for minerals and metals, and megajoules of net calorific value for fossil resources—so they cannot be added or ranked against one another without a prescribed normalization or weighting method.
WDP is not simply cubic metres of water taken from a process. It is deprivation-weighted water consumption, expressed as cubic metres of “world equivalent deprived.” The weighting reflects geographic water availability. EPD International notes that this indicator has high uncertainty and limited practical experience, so a larger WDP value should not be described as the same thing as a larger unweighted withdrawal volume. Check the method, data geography and PCR before drawing conclusions.
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An impact value is meaningful only with its life-cycle scope. Construction EPDs commonly present product-stage modules A1–A3 (raw-material supply, transport and manufacturing), but an EPD may also include construction-process stages, use-stage modules, end-of-life modules and module D benefits or loads beyond the system boundary. A result for A1–A3 alone cannot answer a whole-life question about a building component.
Read the module labels beside every indicator, not just the headline total. A published EPD International declaration example shows how indicator results are laid out by module and accompanied by an acronym key. If one EPD reports A1–A3 and another reports A–C plus D, their apparently similar GWP values are not directly comparable.
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Can I compare impact scores from two EPDs?
Yes, but only after confirming that the declarations describe compatible products, rules and scopes. Similar-looking numbers do not make a valid comparison when the functional unit, modules or assessment method differ.
- Match the product category and PCR. Confirm that both declarations follow the same product-category rules, geographic program requirements and PCR version. If a PCR conflicts with general program guidance, the PCR and applicable normative standard govern.
- Match the declared or functional unit. A result per kilogram, cubic metre, square metre or service provided over a reference period answers a different question. Convert units only when the conversion data and assumptions are documented.
- Match life-cycle modules. Compare A1–A3 with A1–A3, or compare the same full set of modules. Treat module D separately unless the rules explicitly define how it is to be used.
- Match the indicator and unit. Compare GWP-total with GWP-total, EP-freshwater with EP-freshwater and so on. Never compare kg CO2 eq. directly with kg P eq., mol H+ eq. or m3 world eq. deprived.
- Match the impact-assessment method and version. Characterization factors and reporting provisions can change. Record the standard, PCR, database and method version shown in each EPD.
- Check data quality and assumptions. Review declared manufacturing locations, electricity mixes, allocation, recycled content, biogenic carbon and end-of-life scenarios. A lower result may reflect a different scenario rather than a better product.
After these checks, comparisons can support a specified design or procurement decision. They still do not create a universal environmental ranking. The DAPHabitat PCR explains that LCIA results are relative terms and do not predict category-limit exceedance, safety margins or risks.
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Differences can arise from the product’s recipe and factory, but also from modeling choices. Electricity generation data, transport distances, allocation of co-products, recycled-material assumptions, reference service life, end-of-life routes, module coverage and the chosen database all influence the inventory and therefore the indicators. PCRs can also prescribe different scenarios for a product category.
Version control is essential. The EN 15804+A2 corrigendum changed at least the freshwater eutrophication unit, and program operators publish their own guidance and PCR revisions. Record the EPD publication date, validity, PCR edition and impact-assessment method when storing a value in a specification or carbon model.
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What should an EPD reader report in a project specification?
For an auditable specification, copy more than a single climate number. Record the product and manufacturer identification, declared or functional unit, PCR and standard, EPD validity, modules included, each required indicator with its unit, and any scenario or data-quality notes. State whether module D is shown and how it is treated in the project calculation.
When a design team asks for “the lowest-impact product,” clarify the decision boundary first: lowest GWP-total for A1–A3, lowest whole-life result for modules A–C, or a balanced review across all mandatory indicators? The answer can change when the boundary changes. Present the individual indicators rather than collapsing them into one score unless a recognized, declared normalization and weighting method specifically authorizes that step.
What are the main interpretation pitfalls?
- Calling an indicator a measured impact. It is a modeled potential result derived from inventory data and characterization factors.
- Ignoring the unit. Reference equivalents are not interchangeable physical quantities.
- Mixing modules. Product-stage values cannot stand in for whole-life performance.
- Using an old unit table. Verify the standard and corrigendum, especially for EP-freshwater.
- Equating WDP with water withdrawal. WDP includes regional deprivation weighting and carries stated uncertainty.
- Ranking products across different PCRs. A method or scenario difference can dominate the product difference.
- Turning LCIA into a compliance claim. EPD results do not by themselves establish that a threshold, safety margin or risk has been exceeded.
What is the practical definition to remember?
An EPD impact category is the environmental issue being assessed; its indicator is the method-defined numerical expression, with a reference unit, that reports potential contribution to that issue. For construction EPDs, interpret the indicator only alongside its PCR, EN 15804 version, life-cycle modules, declared or functional unit and modeling assumptions. That discipline prevents the most common errors: treating potential impacts as observed damage, comparing unlike scopes and reading one climate or water number as a complete environmental verdict.
Frequently Asked Questions
Are EPD impact categories the same as environmental damage categories?
No. EPD categories organize modeled potential contributions, whereas observed damage depends on location, exposure, ecosystem conditions and other factors not represented by a single product declaration. Use an EPD as life-cycle evidence, not as a site-specific risk assessment.
Why does an EPD show a negative climate value in one module?
A negative module result can reflect modeled biogenic-carbon storage or credits under the applicable accounting rules. It does not prove a permanent net removal for the product’s entire life cycle; inspect GWP-fossil, GWP-biogenic, GWP-luluc, end-of-life assumptions and the total together.
Can I convert every EPD result to a score out of 100?
Not legitimately without a declared normalization and weighting method. The indicators use different reference substances and units, and combining them introduces value choices that must be transparent and permitted by the governing PCR or assessment framework.
Where can I verify an indicator abbreviation or unit?
Start with the EN 15804+A2 corrigendum and then check the EPD program’s current guidance and the product-category PCR. The PCR and normative standard take precedence when program guidance and category-specific rules differ.
