Scope 3 Category 6: Business Travel Emissions Explained

Understanding Scope 3 Category 6: Business Travel Emissions

Scope 3 Category 6 captures greenhouse gas emissions from employee business travel in vehicles that your company doesn't own or operate. This category represents a significant portion of many organizations' carbon footprints - particularly for multinational firms, consulting companies, and businesses with distributed workforces. Unlike Scope 1 and 2 emissions, which come from sources you directly control, Category 6 emissions arise from third-party transportation services used for work purposes.

The GHG Protocol defines this category as "Business Travel - Emissions from the transportation of employees for business purposes in vehicles not owned or operated by the reporting company." It's one of the most frequently reported Scope 3 categories because it directly links to company spending and employee activities, making it both measurable and manageable.

What Counts as Scope 3 Category 6 Emissions

Transportation Modes Included

Business travel emissions encompass multiple transport modes. Commercial flights - whether domestic, short-haul (under 3-4 hours), or long-haul international routes - represent the largest contributor for most organizations. Rail travel, hire cars, taxis, ride-sharing services, and shuttle buses all fall within this category when used for business purposes.

The key distinction is that the company must not own or operate the vehicle. If employees drive company-owned cars, that's Scope 1. If they use public transport or hire vehicles, that's Category 6.

Hotels and Accommodation

Hotels present a gray area in carbon accounting. The GHG Protocol technically classifies accommodation under Category 6, though some organizations treat it separately. Hotel emissions include energy consumption for heating, cooling, lighting, and hot water during employee stays. We recommend consulting your accounting framework - How to Calculate Scope 3 Emissions provides detailed guidance on boundary-setting for your specific situation.

What's Excluded

Commuting to regular workplace offices doesn't count as business travel - that's Scope 3 Category 7. Personal leisure travel, even if booked on a company credit card, is also excluded.

Calculating Business Travel Emissions: Practical Methods

Using Emission Factors

The most straightforward approach uses standardized emission factors measured in kilograms of CO2 equivalent per passenger-kilometer (kg CO2e/pkm):

• Long-haul economy flights: 0.195 kg CO2e/pkm
• Short-haul flights: 0.254 kg CO2e/pkm
• Rail travel: 0.036 kg CO2e/pkm
• Taxi and ride-sharing: 0.153 kg CO2e/pkm

To calculate: Total distance (kilometers) × passengers × emission factor = carbon footprint.

For a London-to-New York flight carrying 150 passengers covering 5,570 km, the total emissions would be: 5,570 × 150 × 0.195 = 162,862.5 kg CO2e (or 162.9 tonnes).

The Radiative Forcing Factor

Aviation's climate impact extends beyond carbon dioxide. Aircraft emit nitrogen oxides, produce contrails, and cause radiative forcing - additional warming effects at high altitudes. The GHG Protocol recommends applying a radiative forcing index (RFI) multiplier of 2-3 to aviation emissions to account for these non-CO2 effects. This means flight emissions might be 2-3 times higher than raw CO2 calculations suggest.

However, applying RFI remains optional and inconsistent across organizations. We recommend disclosing whether you've applied it and which multiplier you used for transparency and comparability.

Collecting Business Travel Data

Primary Data Sources

Expense management systems provide the most accurate starting point. Most corporate expense tools track flight bookings, hotel reservations, and taxi receipts with distance and cost data.

Travel management companies (TMCs) offer detailed reports including departure/arrival cities, kilometers traveled, and passenger counts. These reports often integrate directly with carbon accounting platforms like Greenio, automating much of the calculation process.

Employee self-reporting supplements these sources for smaller trips or personal vehicle rentals not captured by corporate systems. Implementation requires clear guidelines about what qualifies and how to record distances.

Data Quality Considerations

Combining multiple sources prevents double-counting. If your TMC already captures flights, don't also count them in expense reports. Regular reconciliation between systems ensures completeness and accuracy - gaps often emerge for car hire, taxis, and international rail travel.

Strategies to Reduce Business Travel Emissions

Implementing a Travel Policy

Establish a hierarchy favoring lower-carbon options: virtual meetings first, rail for journeys under 4 hours, economy class for flights. Some organizations incentivize carbon-conscious choices through expense reimbursement structures. How to Reduce Scope 3 Emissions offers comprehensive strategies beyond travel alone.

Building a Virtual Meeting Culture

Pandemic-era technology investments proved that many meetings don't require in-person attendance. Maintain hybrid meeting standards, invest in video conferencing quality, and establish meeting guidelines that discourage unnecessary travel.

Rail-First Commitments

For European and Asian routes, high-speed rail offers competitive journey times with a fraction of aviation's emissions. A London-to-Paris train produces roughly 15 times less carbon than a flight on the same route.

Frequently Asked Questions

What is included in Scope 3 Category 6 business travel?

Category 6 covers all employee business travel in vehicles the company doesn't own or operate - flights, trains, hire cars, taxis, and hotels. It excludes commuting and personal travel, and only applies to vehicles you don't control (company cars are Scope 1).

How do I calculate flight emissions for carbon reporting?

Multiply the flight distance in kilometers by the number of passengers by the relevant emission factor (0.195 kg CO2e/pkm for long-haul economy, 0.254 for short-haul). Optionally apply a radiative forcing multiplier of 2-3 to account for non-CO2 aviation impacts at altitude.

Should I include hotels in Scope 3 Category 6?

Yes - the GHG Protocol classifies accommodation emissions within Category 6. However, boundary decisions vary by organization. Clarify your methodology in sustainability disclosures and remain consistent year-to-year for valid comparisons.

What is radiative forcing and should I include it?

Radiative forcing accounts for warming effects beyond CO2 - contrails, nitrogen oxides, and high-altitude cloud formation. The GHG Protocol recommends a 2-3x multiplier, though it's optional. Always disclose whether you've applied it.

When should I start collecting Category 6 data?

Immediately. Business travel represents 5-15% of typical organizational footprints. Most companies establish baseline data in their first reporting year, then set reduction targets for subsequent years as part of BRSR, CSRD, or SECR compliance. See how carbon accounting for professional services firms handle this in practice.

Conclusion

Scope 3 Category 6 business travel emissions are material, measurable, and actionable. By understanding what counts, mastering the calculation methodology, and implementing reduction strategies, you can meaningfully lower your carbon footprint while improving cost efficiency. Start with expense system integration and travel management company reports, apply consistent emission factors, and transparently communicate your methodology in sustainability reports.