What are downstream emissions?

Quick Answer: Downstream emissions are the greenhouse gas emissions that occur after a company's product or service leaves its direct control, covering everything from transportation and distribution through to product use, end-of-life treatment, and customer activities. They sit within Scope 3 of the GHG Protocol and typically represent the largest share of a company's total carbon footprint. Measuring them accurately is essential for any organisation working towards a credible, full-scope emissions inventory.

What Are Downstream Emissions?

Downstream emissions are the Scope 3 emissions generated in the value chain after a product or service has been sold or transferred to a customer. The term "downstream" refers to the direction of flow: away from the company, towards the end user and beyond.

Under the GHG Protocol's Scope 3 standard, downstream emissions are grouped into eight distinct categories. These span activities the company does not directly control but still has a material connection to, because the product or service it sells is the reason those emissions exist.

For most companies, downstream emissions are significantly larger than their Scope 1 and 2 emissions combined. A manufacturer whose product runs on electricity for ten years, for example, will generate far more emissions through customer use than through its own factory operations.

What Categories Fall Under Downstream Emissions?

The GHG Protocol defines eight downstream Scope 3 categories:

• Category 9: Downstream transportation and distribution. Emissions from transporting products after the point of sale, including third-party logistics providers delivering to end customers.
• Category 10: Processing of sold products. Relevant where an intermediate product requires further processing by the buyer before it reaches the end user.
• Category 11: Use of sold products. Emissions generated when customers use the product, for example, fuel burned in a sold vehicle or electricity consumed by a sold appliance.
• Category 12: End-of-life treatment of sold products. Emissions from waste processing, landfill, incineration, or recycling once a customer disposes of the product.
• Category 13: Downstream leased assets. Emissions from assets the company owns but leases out to other parties.
• Category 14: Franchises. Emissions from franchise operations, relevant where a franchisor does not consolidate franchise sites into its own operational boundary.
• Category 15: Investments. Emissions associated with the company's equity investments, project finance, or debt financing. This category is particularly significant for financial institutions.
• Category 16: Use of sold services (added in updated guidance). Relevant for service businesses, covering emissions generated as customers use the service provided.

Not every category is relevant to every business. A professional services firm has no Category 10 or 12 emissions. A consumer electronics manufacturer has significant Category 11 and 12 exposure. Identifying which categories are material to your business is the first step in a credible Scope 3 assessment.

Why Do Downstream Emissions Matter for Carbon Reporting?

Downstream emissions matter because ignoring them produces an incomplete picture of a company's climate impact. A full-scope carbon footprint, aligned with the GHG Protocol, requires reporting on all material Scope 3 categories, both upstream and downstream.

For many businesses, Category 11 (use of sold products) alone accounts for 70-90% of total emissions. This is well-documented in sectors like automotive, consumer electronics, and energy. Reporting only Scope 1 and 2 in these cases would dramatically understate the company's true footprint.

Beyond accuracy, downstream emissions are increasingly relevant for compliance and stakeholder reporting. Frameworks including SBTi target-setting, B Corp certification, SECR, and supply chain due diligence requests from larger customers all push companies towards a fuller Scope 3 disclosure. Organisations that have only measured their operational emissions are likely to face growing pressure to go further.

There is also a strategic dimension. Understanding where downstream emissions concentrate helps companies identify which product design decisions, customer use patterns, or end-of-life processes offer the greatest decarbonisation opportunity. That is not possible without first measuring them.

How Are Downstream Emissions Measured?

Measuring downstream emissions is more complex than measuring Scope 1 and 2, because the data sits outside the company's direct operations. The GHG Protocol allows several calculation approaches depending on data availability:

Spend-based methods use financial spend as a proxy, applying average emissions intensity factors by category. These are a reasonable starting point but tend to be less accurate for categories like product use, where actual consumption data is available.

Average-data methods apply industry-average emissions factors to units of product sold. For example, applying an average emissions factor per tonne of product shipped for Category 9.

Activity-based methods use actual activity data, such as energy consumption per product per year, to calculate Category 11 emissions. This approach produces more accurate results and is preferable where the data can be obtained.

Supplier-specific or product-level data (including Environmental Product Declarations and Product Carbon Footprints) can be used where available, and produce the most accurate results for product-level assessments.

In practice, most companies use a combination of methods across different downstream categories, moving towards more granular data over time as reporting matures.

What Is the Difference Between Upstream and Downstream Emissions?

Upstream and downstream emissions are both subsets of Scope 3, distinguished by their position in the value chain relative to the reporting company.

Upstream emissions occur before the product or service reaches the company: raw material extraction, supplier manufacturing, business travel, employee commuting, and purchased goods and services all fall upstream.

Downstream emissions occur after the product or service leaves the company: transportation to the end customer, customer use, and end-of-life disposal all fall downstream.

The distinction matters for prioritisation. A company that manufactures physical products sold to consumers often has its largest emissions exposure downstream, in how those products are used. A company that buys complex manufactured components and assembles them often has its largest exposure upstream, in its supply chain. Knowing which side of the value chain drives the most emissions shapes where decarbonisation efforts will have the most impact.

Measuring Downstream Emissions in Practice

For companies new to Scope 3 reporting, downstream emissions can feel like the most difficult part of a carbon footprint to tackle. The data is harder to access, the categories are varied, and some, like Category 15 for financial institutions, require specialist methodologies.

A practical starting point is a materiality screening: a structured assessment of which downstream categories are likely to be significant for your business, based on sector, product type, and revenue mix. This narrows the scope to the categories worth investing measurement effort in, and allows companies to apply spend-based estimates to lower-priority categories while using more robust methods where it counts.

Seedling supports full Scope 3 measurement, including downstream categories, with built-in methodology guidance and a dedicated carbon expert who helps users identify which categories apply to their business and how to approach data collection. The goal is a GHG Protocol-aligned inventory that is accurate enough to be credible with stakeholders, without requiring a team of specialists to produce it.

As reporting expectations continue to rise, downstream emissions are shifting from a "nice to have" addition to a baseline requirement for serious carbon management.