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* States: add unavailable and unknown * rephrase intro * Make states lowercase * Update source/_integrations/humidifier.markdown Co-authored-by: Klaas Schoute <klaas_schoute@hotmail.com> * Revert "Make states lowercase" This reverts commit daf7f06630c4a2cc1f7e7fe5d043d9754a79cd1d. * Apply bold to the UI string of state names * Climate: fix grammar --------- Co-authored-by: Klaas Schoute <klaas_schoute@hotmail.com>
39 lines
1.5 KiB
Markdown
39 lines
1.5 KiB
Markdown
---
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title: Air quality
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description: Instructions on how to add air quality sensors with Home Assistant
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ha_release: 0.85
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ha_domain: air_quality
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ha_quality_scale: internal
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ha_category: []
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ha_codeowners:
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- '@home-assistant/core'
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ha_integration_type: entity
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---
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The **Air quality** {% term integration %} allows other integrations to process information about air quality and pollution details. It is used by integrations that provide an `air_quality` sensor - you can find those under the `health` [integrations](/integrations/#health).
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The platforms cover the following levels (if they are available):
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- The particulate matter 0.1 (<= 0.1 μm) level.
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- The particulate matter 2.5 (<= 2.5 μm) level.
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- The particulate matter 10 (<= 10 μm) level.
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- The Air Quality Index (AQI).
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- The O3 (ozone) level.
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- The CO (carbon monoxide) level.
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- The CO2 (carbon dioxide) level.
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- The SO2 (sulphur dioxide) level.
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- The N2O (nitrogen oxide) level.
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- The NO (nitrogen monoxide) level.
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- The NO2 (nitrogen dioxide) level.
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{% include integrations/building_block_integration.md %}
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## The state of an air quality entity
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The state of an air quality entity represents the concentration of particles in the air that are 2.5 microns or fewer in diameter. The state is a number. The number is followed by the unit of measurement (micrograms per cubic meter: "µg/m³"). For example, *PM2.5: 4 µg/m³*. In this example, the state is 4.
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In addition, the entity can have the following states:
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- **Unavailable**: The entity is currently unavailable.
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- **Unknown**: The state is not yet known.
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