---
title: MTRNitrogenDioxideConcentrationMeasurementMeasurementUnit.PPB
framework: matter
role: symbol
role_heading: Case
path: matter/mtrnitrogendioxideconcentrationmeasurementmeasurementunit/ppb
---

# MTRNitrogenDioxideConcentrationMeasurementMeasurementUnit.PPB

## Declaration

```swift
case PPB
```