---
title: MTRTotalVolatileOrganicCompoundsConcentrationMeasurementMeasurementUnit.PPB
framework: matter
role: symbol
role_heading: Case
path: matter/mtrtotalvolatileorganiccompoundsconcentrationmeasurementmeasurementunit/ppb
---

# MTRTotalVolatileOrganicCompoundsConcentrationMeasurementMeasurementUnit.PPB

## Declaration

```swift
case PPB
```