New EPA correction?

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The latest update contains “An updated US EPA conversion.”

Can you let us know what it is, or point us to a document?

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Hi @dclaar

Thanks for the question. We’ve updated the map descriptions to more clearly define the difference. To keep it short, the new conversion uses new CF_1 equations for indoor sensors posted here: Correction and Accuracy of PurpleAir PM2.5 Measurements for Extreme Wildfire Smoke.

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So this is not relevant for external sensors, and may only be useful for wildfire smoke?