> For the complete documentation index, see [llms.txt](https://knowledge.co2ai.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://knowledge.co2ai.com/provide-product-emissions-data/share-of-primary-data.md).

# Share of primary data

How to determine the share of primary data in your calculations

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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