Some devices (like Xiaomi Cleargrass) report tVOC value measured in ppb or ppm.
Seems to be resolved here:
home-assistant:dev ← home-assistant:voc_parts_device_class
opened 07:03AM - 12 May 23 UTC
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## Proposed change
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Add sensor device class `volatile_organic_compounds_parts`
In a follow-up PR, unit conversion between ppm and ppb will be added.
Architecture discussion: <https://github.com/home-assistant/architecture/discussions/858#discussioncomment-4775762>
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home-assistant:dev ← trvrnrth:volatile_organic_compounds_parts
opened 06:58PM - 18 May 23 UTC
## Proposed change
Add `volatile_organic_compounds_parts` device class to fro… ntend (companion to https://github.com/home-assistant/core/pull/92973).
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