Does TRACI 2.1 use the latest IPCC global warming potentials?

In U.S. construction EPD practice, the ISO21930‑LCIA‑US dataset pairs TRACI 2.1 indicators with IPCC AR5 100‑year GWPs for greenhouse gases. Other categories retain TRACI 2.1 factors. Always state which set you used to keep comparisons fair (Data.gov, 2025).

Is TRACI 2.1 required for LEED?

LEED allows different impact methods, but U.S. projects commonly use TRACI. The LEED v4 Option 4 threshold requires a 10% GWP cut and 10% in two other indicators, with no indicator up more than 5%, which pushes teams to request consistent TRACI reporting in EPDs (USGBC, 2025).

What changed after TRACI 2.1?

EPA released spatially specific eutrophication factors and posts current downloads on its TRACI page. Some tools still label results “TRACI 2.1,” so cite the factors’ year in addition to the method name for clarity (EPA, 2025).

TRACI 2.1 for Manufacturers

TRACI 2.1 in a nutshell

TRACI is the U.S. EPA’s life cycle impact assessment method. Think of it as the unit system behind your EPD, the rules that turn emissions and resource use into comparable impact indicators. TRACI 2.1 covers climate change, ozone depletion, acidification, eutrophication, smog formation, human health effects, ecotoxicity, and fossil fuel depletion.

Where it shows up in your EPD

Many North American construction EPDs report TRACI indicators consistent with ISO 21930. For greenhouse gases, the U.S. government’s ISO21930‑LCIA‑US dataset applies 100‑year GWPs from IPCC AR5 while keeping other factors aligned with TRACI 2.1, which is important when you benchmark or compare versions (Data.gov, 2025) (Data.gov, 2025).

TRACI 2.1 vs 2.2, what changed

EPA added spatially specific eutrophication factors in 2021 and posts current TRACI downloads on its site. You may still see “TRACI 2.1” in tools, yet factors for eutrophication can reflect newer work, so name the method and the factor vintage in your reports to avoid apples to oranges surprises (EPA, 2025) (EPA, 2025).

What these categories actually reward

Cutting natural gas, diesel, and grid electricity reduces fossil fuel depletion and often your TRACI climate number. Reducing NOx and VOCs from firing, curing, or coating lines lowers smog formation. Closing nutrient loops in wastewater lowers eutrophication. Dust and fine particulate controls help the particulate matter result that EPD reviewers scan first in industrial processes.

Units that matter at a glance

GWP is reported in kilograms of CO2e. Ozone depletion uses kg CFC‑11e. Acidification is commonly kg SO2e. Eutrophication is typically kg N‑eq. Smog formation is reported in kg O3‑eq. Human health toxicity results appear as comparative toxicity units, and ecotoxicity as CTUe. If your draft shows different units, clarify which TRACI build and mapping were used so reviewers do not bounce it back.

How TRACI ties to LEED

In LEED v4 Option 4, project teams must show at least a 10% reduction in GWP and a 10% reduction in two additional impact measures, with no measure increasing by more than 5%. That math depends on consistent characterization factors, which is why teams ask for TRACI and a stated version in product EPDs (USGBC, 2025) (USGBC, 2025).

Common pitfalls that slow approvals

Mixing inventories built with different TRACI vintages blurs comparisons. Treating all methane as fossil when some is biogenic can skew GWP. Ignoring site‑specific nutrient releases makes eutrophication look worse or better than reality. If trustworthy normalization or weighting data for your product class are missing, say so plainly in the EPD notes rather than guessing.

Speed moves the needle, accuracy seals it

TRACI can feel abstract until a submittal stalls. Set your reference year, nail utility and throughput data, and label the method and factor set clearly. We prefer to lock the data intake once, then carry it through PCR rules to a clean, defensible EPD that gets accepted the first time. It definately beats a ping‑pong of clarifications.