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ecoTriverecoTriver
Sustainability manager analysing event audience-travel emissions on a dashboard

For Sustainability Managers

Audience-travel emissions you can put in your CSRD report.

Primary activity data, UBA TREMOD 2024 emission factors. Built for festivals, concerts, sporting events, venues and tour productions.

Book a 30-min methodology walkthroughRead the full methodology

What ecoTriver is, in one paragraph

ecoTriver is an audience-travel emissions data layer for events. We capture primary activity data (passenger-kilometres travelled in matched shared rides), apply the UBA TREMOD 2024 emission factor (0.164 kg CO₂e/km, German fleet-average passenger car), and produce per-ride and per-event records exportable into your GHG Protocol Scope 3 inventory (Category 9 or "other"), CSRD ESRS E1 disclosures, GRI 305-3 reporting, ISO 20121 management system and SBTi Scope 3 target tracking.

For sports clubs: reporting fan travel

How a club measures its fans' travel, which Scope 3 category fits and what the season's data package contains.

Go to the sports club page

60–80%

of an event's total emissions typically come from audience travel, and most of it is never measured.

The Scope 3 gap most events have

Industry research from Julie's Bicycle, A Greener Future and the Powerful Thinking ‘Show Must Go On' report consistently places visitor mobility as the dominant emission category for festivals, concerts and sporting events, ahead of energy, food, freight and accommodation combined. It also remains the least-measured category, because organisers lack a primary-data source. ecoTriver closes that gap by replacing modal-split surveys with measured ride-level activity data.

What ecoTriver gives a sustainability manager

Primary activity data

Per-ride distance × passengers × emission factor. Not modal-split surveys, not industry averages, but the passenger-kilometres of every matched ride.

UBA TREMOD 2024 emission factor

0.164 kg CO₂e/km from the German Federal Environment Agency's TREMOD 6.71B model, the German federal reference for road-transport emission factors. Versioned in code, updated annually.

Per-event exportable records

CSV/JSON export per event. Drop directly into the carbon accounting or LCA platform of your choice.

EU-hosted, with data rights built in

The application database and file storage run on Supabase in the EU (AWS eu-central-1, Frankfurt), infrastructure certified to ISO 27001. Data portability and erasure are built into the user account surface and exercisable directly by the data subject. Which processors are involved, and how transfers outside the EU are safeguarded, is set out in the privacy policy.

Framework alignment

Where ecoTriver data fits in the standards your auditor expects.

GHG Protocol Corporate Value Chain (Scope 3) Standard

Category 9: Downstream transportation, optionally including customer travel

UEFA's spectator-travel guidance (August 2026) assigns fan travel to Category 9. ecoTriver supplies per-ride passenger-kilometres with a documented emission factor source for it.

GHG Protocol Corporate Value Chain (Scope 3) Standard, §11.2

Other (optional): travel of attendees to events, reported separately

If you do not assign attendee travel to Category 9, you report it here separately. The data is the same; you document the category and the boundary in your report.

GRI 305: Emissions

Disclosure 305-3: Other indirect (Scope 3) GHG emissions

Audience-travel category covered with primary data, calculation methodology and emission factor source disclosed in /methodology.

CSRD / ESRS E1: Climate Change

E1-6, from financial year 2027 E1-8: gross Scope 3 emissions; E1-3 Actions and resources, E1-4 Targets

Quantitative Scope 3 emission data plus qualitative narrative on mitigation actions (shared rides). Output structured to fit the ESRS E1 reporting workflow.

Science Based Targets initiative (SBTi)

Scope 3 target tracking, especially for FLAG and event-led organisations

Year-on-year primary-data tracking of mitigation interventions (modal shift to shared rides).

ISO 20121: Event Sustainability Management

Clauses 4.5 (Issues), 6.1.2 (Risks/opportunities), 9 (Performance evaluation)

Covered end-to-end: audience-travel materiality assessment, mitigation programme, KPI dashboard and stakeholder communication.

Framework citations are best-fit mappings, not certifications. Full methodology, assumptions and version history are documented at /methodology and in the GCCM007-alignment document.

Methodology snapshot

0.164

kg CO₂e / km

Emission factor

UBA TREMOD 6.71B (2024), German fleet-average passenger car

Read the full methodology

How this differs from what you're doing now

Primary data > survey estimates

Modal-split surveys produce assumption-stacked numbers: average distance × estimated mode share × tier-3 factor. ecoTriver records passenger-kilometres.

Measured > assumed

Most events have a single 'visitor travel' line item populated with industry averages. ecoTriver replaces it with per-ride records.

Pick your event type

Each event type has a tailored ecoTriver surface: fan travel for concerts, multi-day mobility for festivals, recurring matchday flows for sports, venue-wide integration for arenas.

Festivals

Multi-day audience mobility, camping arrival/departure flows, cross-border travel patterns.

Festival showcase

Venues & Arenas

Venue-wide integration across your full event calendar: every show inherits the carpooling layer.

Venues showcase

Concert Tours

Per-leg fan-travel reporting across an artist's entire tour: aggregate impact attributable to one act.

Tours showcase

Sports & Matchdays

Recurring matchday mobility for clubs and leagues: primary data per matchday, season-aggregated reporting.

Sports showcase

Three ways to start the evaluation

Pick the depth that matches your stage in the buying process.

Book a 30-min methodology walkthrough

Live walk-through of the data model, factor sourcing, export formats and framework alignment with the founder. Right depth for technical evaluation.

Read the full methodology

Open-source-style documentation of every constant, calculation and assumption. No login required. Right depth for first-pass evaluation.

Open methodology

Submit a partnership interest form

Tell us about your event(s) and we'll come back with a tailored proposal, including data flow and branding. Right depth for procurement-stage evaluation.

Open partner form

Frequently asked questions

Generic queries that lead a sustainability manager to ecoTriver, answered with the framework-grounded substance you need. Send missing ones via our contact page.

Which Scope 3 category does travel to events belong to?
The GHG Protocol has no category of its own for attendee travel and leaves two routes open. Category 9 (downstream transportation and distribution) may optionally include customer travel; UEFA's spectator-travel guidance (August 2026) places fan travel there. Alternatively, the Scope 3 Standard (§11.2) names travel of attendees to events as an example of emissions reported separately under "other". Both routes are optional; document the category you choose and the boundary. ecoTriver supplies the same primary activity data either way.
Why does audience travel not belong in Category 7?
Category 7 (employee commuting) covers your own employees' journeys between home and workplace. Attendees are not employees, so their travel belongs in Category 9 or under "other". Your own staff's commuting is Category 7 and is not part of the ecoTriver data package.
Which CSRD ESRS E1 disclosures cover audience travel for events?
Three E1 disclosures map directly to audience travel: E1-6, from financial year 2027 E1-8 (Gross Scope 3 GHG emissions: quantitative tCO₂e), E1-3 (Actions and resources: narrative on mitigation programmes such as shared-ride platforms), and E1-4 (Targets: year-on-year reduction tracking against a base year). E1-4 also requires a documented baseline recalculation policy, which is where the choice of fixed or rolling emission factor matters. ecoTriver's per-event reports feed all three.
How does ISO 20121 treat audience travel as an event sustainability issue?
ISO 20121 (Event Sustainability Management Systems) requires organisers to identify material issues (clause 4.5), assess risks and opportunities (6.1.2), and evaluate performance (clause 9). Audience travel is consistently the largest material climate issue for events, typically 60–80% of total event emissions. The standard expects a documented mitigation programme, measurable KPIs and stakeholder communication. ecoTriver provides the materiality data, the operational programme (shared rides), per-event KPIs and a public impact surface: the ISO 20121 lifecycle for audience travel end-to-end.
How do event organisers set SBTi Scope 3 targets when audience travel is the main driver?
The Science Based Targets initiative requires Scope 3 targets when Scope 3 exceeds 40% of total emissions, a threshold most event-led organisations cross via audience travel alone. SBTi accepts targets framed as absolute reductions, intensity reductions (per attendee or per ticket) or supplier engagement. For audience travel specifically, the practical lever is modal shift away from solo driving; ecoTriver provides primary-data tracking of that lever, making target progress measurable rather than estimated.
How does GRI 305-3 reporting work for festival audience travel?
GRI 305-3 (Other indirect Scope 3 GHG emissions) requires reporters to disclose: gross emissions in tCO₂e, gases included, biogenic CO₂ separately if material, the base year, the source of emission factors, the consolidation approach and the calculation methodology. A per-event audience-travel report should supply all seven elements: gross emissions from passenger-km × factor, gases included stated explicitly (the German UBA factor covers CO₂, CH₄ and N₂O as CO₂e under IPCC AR5), a documented base year, a citable factor source (e.g. UBA TREMOD for Germany), operational consolidation, and an activity-data calculation methodology.
Which emission factor should events use to report passenger-car audience travel in Germany?
The most defensible factor for Germany and Central Europe in 2024–2026 is 0.164 kg CO₂e per kilometre, from the German Federal Environment Agency's TREMOD 6.71B model (reference year 2024). TREMOD is the federal reference for road-transport emission factors and feeds the national greenhouse-gas inventory submitted to the UNFCCC. The 0.164 figure represents the German fleet-average passenger car at the national fleet-average occupancy of 1.4 persons. ecoTriver applies it per passenger-kilometre, the methodologically correct unit for shared-ride accounting. Note the gas coverage: the UBA figure covers CO₂, CH₄ and N₂O as CO₂ equivalents under IPCC AR5, including the upstream energy supply, so figures derived from it are disclosed as CO₂e.
Which emission factors does ecoTriver apply to car travel, and why 0.164 kg CO₂e per km?
Booked car rides and declared solo car journeys are calculated with the UBA factors in every country: 0.164 kg CO₂e per passenger-km for the CO₂ a shared ride saves, and 0.230 kg CO₂e per vehicle-km (0.164 × 1.4 average occupancy) for the car rows of the gross Scope 3 figures. Outside Germany, DEFRA/DESNZ factors apply to the register's other modes: coach, rail, flight, public transport and declared carpool journeys. 0.164 is the most defensible car factor for event audiences in Germany because it (a) matches the national inventory factor your auditor will recognise, (b) is fleet-average rather than vehicle-specific, matching the mix of attendee cars, and (c) comes from a public, government-published model rather than a vendor estimate.
What is the difference between primary, secondary and tertiary activity data under GHG Protocol Scope 3 guidance?
Primary data: directly measured from the activity itself (passenger-kilometres of each ride). Secondary data: extrapolated from sample surveys or modelled (modal-split survey × average distance). Tertiary data: industry-average proxies with no specific connection to the reporting entity. The GHG Protocol Scope 3 Calculation Guidance favours primary data for material categories. ecoTriver delivers primary activity data with a tier-2 (regional fleet-average) emission factor: the highest practical data-quality combination given that attendee vehicles are not telemetry-tracked.
How is additionality and counterfactual reasoning handled for shared-ride climate claims?
Activity-level additionality asks whether this rider would have driven solo without the platform; modal-shift claims are not credible without a counterfactual. ecoTriver does not collect a per-rider counterfactual today. Avoided emissions follow the baseline documented at /methodology: each matched passenger is assumed to have driven alone, and that assumption is disclosed rather than discounted ride by ride. What ecoTriver delivers today is measured arrival data.
What does ISSA 5000 require for sustainability assurance of audience-travel emissions?
ISSA 5000 (the new IAASB sustainability assurance standard, effective 15 December 2026, replacing ISAE 3000 / ISAE 3410) requires: clearly defined subject matter, suitable measurement criteria, documented quantification methods, entity-level and process-level controls, evidence-gathering audit trails, and explicit management assertions. For audience travel specifically, that means: every CO₂ figure traceable to raw activity data, the emission factor in force at the time of measurement preserved, immutable historical records, and a publicly disclosed methodology.
Can event organisers export raw ride-level data into a carbon accounting or LCA platform?
Yes. ecoTriver provides per-event ride-level data on request, with one row per ride: ride ID, event ID, distance (km), passenger count, vehicle class, CO₂ saved (kg). Custom field mapping for in-house LCA tools can be agreed in the partnership.
What happens to historical CO₂ figures when UBA publishes a new TREMOD release?
Best practice is to preserve historical figures at the factor in force at the time of the activity. New TREMOD releases trigger a new emission factor constant in source plus a database migration that updates the calculation function.