# Share of primary data

To create visibility on the share of primary data in PCF calculations, the PDS in each data set should be determined (and shared). This can be done by calculating the proportion (percentage) of the total GHG emissions (CO₂e) that is derived using primary data:

![](https://co2ai.notion.site/image/https%3A%2F%2Fs3-us-west-2.amazonaws.com%2Fsecure.notion-static.com%2F547854cf-0b86-44ac-af2c-adb1785dc0a3%2FUntitled.png?table=block\&id=9150dc6e-b211-4dac-8ebf-d1096ef823da\&spaceId=8ff0ca8c-f25b-44aa-bb6b-b9d02c8076a7\&width=2000\&userId=\&cache=v2)

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