---
title: HMCharacteristicMetadataUnitsMicrogramsPerCubicMeter
framework: homekit
role: symbol
role_heading: Global Variable
path: homekit/hmcharacteristicmetadataunitsmicrogramspercubicmeter
---

# HMCharacteristicMetadataUnitsMicrogramsPerCubicMeter

The unit of the characteristic is micrograms per cubic meter.

## Declaration

```swift
let HMCharacteristicMetadataUnitsMicrogramsPerCubicMeter: String
```