---
title: MTRNitrogenDioxideConcentrationMeasurementMeasurementUnit.PPM
framework: matter
role: symbol
role_heading: Case
path: matter/mtrnitrogendioxideconcentrationmeasurementmeasurementunit/ppm
---

# MTRNitrogenDioxideConcentrationMeasurementMeasurementUnit.PPM

## Declaration

```swift
case PPM
```