# Do hydrogen cylinders used in a heat treatment furnace count in Scope 1?

Canonical: https://senseible.earth/answers/hydrogen-cylinders-for-heat-treatment-which-scope

Using hydrogen gives no CO2 at your site, so there is nothing for Scope 1 from the hydrogen itself. The emissions are upstream, where it was made, usually from natural gas. Count those in Scope 3 Category 1 using the supplier figure or a factor per kg of hydrogen.

## What to record

- Cylinders or kg of hydrogen bought, from invoices.
- The supplier production route, if they share it.
- Any other gas mixed in, such as nitrogen.

## Where Scope 1 still appears

If the furnace also burns natural gas or LPG for heat, or burns off a carbon-bearing atmosphere, that fuel is Scope 1.

## What Senseible does here

Senseible reads bills, fuel invoices and production records into dated, fingerprinted records, so the figure you send a buyer can be traced to its documents.

- [Industrial gases in Scope 3](https://senseible.earth/answers/industrial-gases-oxygen-nitrogen-scope-3)
- [SMR hydrogen per kg](https://senseible.earth/answers/smr-hydrogen-co2-per-kg)
- [Induction vs furnace hardening](https://senseible.earth/answers/induction-hardening-vs-furnace-hardening-co2)

Sources: [GHG Protocol Corporate Standard](https://ghgprotocol.org/corporate-standard), [GHG Protocol Scope 3 Standard](https://ghgprotocol.org/corporate-value-chain-scope-3-standard), [2006 IPCC Guidelines for National Greenhouse Gas Inventories](https://www.ipcc-nggip.iges.or.jp/public/2006gl/)

Last reviewed 2026-10-23.