Using Scope 5 Resources to Quantify Fugitive Emissions



This article discusses various options for quantifying fugitive emissions in Scope 5 resources.

Fugitive Emissions can be quantified in Scope 5 in two ways:

  1. Using resources in the Scope 5 standard Fugitive Emissions (AR5) library.
  2. Creating a custom resource.

In the following sections, we’ll discuss how to use both methods.

Using the AR5 Library

When configuring fugitive emissions trackers, we recommend searching the Fugitive Emissions (AR5) library to see if the gas you’re tracking is included. If it is, we recommend using this approach. For more info on this library refer to the Fugitive Emissions (AR5) Library article.

Creating a Custom Resource

If the fugitive gas you’re tracking is not included in the Fugitive Emissions (AR5) library, we generally recommend creating a custom resource for the gas. If the gas is commonly used and it’s GWP is documented by an authoritative source, please contact us - we may consider adding it to our standard library.

There are two ways to create a custom resource for a fugitive gas:

  1. Using Scope 5 built-in impact metrics
  2. Creating a custom impact metric and a CO2e factor.

Both start by creating a custom resource in your custom resource library. For guidance on setting up custom resources, refer to this article.

After you’ve created your custom resource, click Add New Conversion Factor Set.

Using Built-In Impact Metrics

This is the preferred method for creating your custom resource. To determine whether this method can be used, inspect the Add a Factor control drop-down menu to determine if the gas you’re looking for is already included as a Scope 5 impact metric (under the Other GHG group):

If it isn’t, skip to the next section.

If it is, select the gas. You’ll be able to select the GWP to use:Screen_Shot_2020-03-17_at_6.20.29_PM.png

You can also use this method to create a custom resource for blended gases if each of your blend’s component gases is included in the drop-down list of impact metrics. To do so, create a resource for the blend, add each of the component gases, and enter their proportion of the blend into the corresponding emissions factor box. This is illustrated below for the common R-404a blend:

Using built-in impact metrics is recommended if:

  • You’d like to use GWPs other than AR5.
  • You’d like to create a resource for a blend that isn’t included in the standard Fugitive Gases library.

Creating a Custom Impact Metric and a CO2e Factor

If the gas you’d like to track isn’t in the AR5 library and isn’t available in the drop-down list of impact metrics, you can quantify the emissions for this gas by creating one factor for the gas itself (a custom impact metric) and another quantifying the CO2e emissions.

First, find the GWP for your gas.

Next, use the impact dropdown and select -- define new -- :


Type the name of your gas in the name box (R-448a in the example below). This is likely the same as the resource name. Type 1 in the emissions factor box and make sure that the numerator and denominator units are the same. This will allow you to report on the total weight of this gas as its own metric:

Next, use the same impact dropdown and select CO2e under Total GWP. In the emissions factor box, type the GWP you found in your research. Again, make sure that the numerator and denominator units are the same:Screen_Shot_2020-03-17_at_6.33.56_PM.png

Then, save your emissions factor:


The Scope 5 team is always available to help, whether that means navigating the application, making changes to your account configuration or just answering questions.

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