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Add ppm to NITROGEN_DIOXIDE units #2958

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Add ppm to NITROGEN_DIOXIDE units #2958

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cc53e0f
Add ppm unit for nitrogen dioxide
lboue Feb 14, 2026
f397156
Fix micro symbol: use µ instead of μ for consistency
lboue Feb 14, 2026
4383518
Fix typo in nitrogen_dioxide description
lboue Feb 16, 2026
75c505e
Update air-quality.md
lboue Feb 16, 2026
91a29fb
Merge branch 'master' into nitrogen_dioxide_ppm
lboue Feb 16, 2026
01f0d33
Merge branch 'master' into nitrogen_dioxide_ppm
lboue Feb 19, 2026
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2 changes: 1 addition & 1 deletion docs/core/entity/air-quality.md
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Expand Up @@ -29,6 +29,6 @@ The Air Quality entity does not support attribute shorthand for [property implem
| sulphur_dioxide | <code>str &#124; int &#124; float &#124; None</code> | `None` | The SO2 (sulphur dioxide) level.
| nitrogen_oxide | <code>str &#124; int &#124; float &#124; None</code> | `None` | The N2O (nitrogen oxide) level.
| nitrogen_monoxide | <code>str &#124; int &#124; float &#124; None</code> | `None` | The NO (nitrogen monoxide) level.
| nitrogen_dioxide | <code>str &#124; int &#124; float &#124; None</code> | `None` | The NO2 (nitrogen dioxide) level.
| nitrogen_dioxide | <code>str &#124; int &#124; float &#124; None</code> | `None` | The NO2 (nitrogen dioxide) level. Supported units: `ppb`, `ppm`, `μg/m³`.

Properties have to follow the units defined in the `unit_system`.
2 changes: 1 addition & 1 deletion docs/core/entity/number.md
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Expand Up @@ -56,7 +56,7 @@ If specifying a device class, your number entity will need to also return the co
| `NumberDeviceClass.IRRADIANCE` | W/m², BTU/(h⋅ft²) | Irradiance
| `NumberDeviceClass.MOISTURE` | % | Moisture
| `NumberDeviceClass.MONETARY` | [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217#Active_codes) | Monetary value with a currency.
| `NumberDeviceClass.NITROGEN_DIOXIDE` | ppb, µg/m³ | Concentration of nitrogen dioxide
| `NumberDeviceClass.NITROGEN_DIOXIDE` | ppb, ppm, µg/m³ | Concentration of nitrogen dioxide
| `NumberDeviceClass.NITROGEN_MONOXIDE` | ppb, µg/m³ | Concentration of nitrogen monoxide
| `NumberDeviceClass.NITROUS_OXIDE` | µg/m³ | Concentration of nitrous oxide
| `NumberDeviceClass.OZONE` | ppb, µg/m³ | Concentration of ozone
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2 changes: 1 addition & 1 deletion docs/core/entity/sensor.md
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Expand Up @@ -59,7 +59,7 @@ If specifying a device class, your sensor entity will need to also return the co
| `SensorDeviceClass.IRRADIANCE` | W/m², BTU/(h⋅ft²) | Irradiance
| `SensorDeviceClass.MOISTURE` | % | Moisture
| `SensorDeviceClass.MONETARY` | [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217#Active_codes) | Monetary value with a currency.
| `SensorDeviceClass.NITROGEN_DIOXIDE` | ppb, µg/m³ | Concentration of nitrogen dioxide
| `SensorDeviceClass.NITROGEN_DIOXIDE` | ppb, ppm, µg/m³ | Concentration of nitrogen dioxide
| `SensorDeviceClass.NITROGEN_MONOXIDE` | ppb, µg/m³ | Concentration of nitrogen monoxide
| `SensorDeviceClass.NITROUS_OXIDE` | µg/m³ | Concentration of nitrous oxide
| `SensorDeviceClass.OZONE` | ppb, µg/m³ | Concentration of ozone
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