---
title: MTRCarbonDioxideConcentrationMeasurementMeasurementUnit.PPB
framework: matter
role: symbol
role_heading: Case
path: matter/mtrcarbondioxideconcentrationmeasurementmeasurementunit/ppb
---

# MTRCarbonDioxideConcentrationMeasurementMeasurementUnit.PPB

## Declaration

```swift
case PPB
```