The Eve app is the best way to set triggers from information like air quality, temperature or humidity. The Apple Home app cannot (yet) do that. With the current version of Eve it’s easy to set it to trigger with any change in air quality with a condition where the value changes. The new version adds the ability to trigger if the reading is “worse or equal to” a particular reading such as “Inferior” air quality. You can even create several rules that make the Eve Flare glow in different colors depending on the air quality.
The first step is to create a scene for Eve Flare, such as a red warning light. To do this, select Scenes in the table bar, then the Scenes tab > Edit > Add Scene. Here select Add Action, the room in which Eve Flare stands and activate Power > On and Color > Scarlet Template. Then select Add, Next and select an icon and a name for the scene, such as Air Quality Red. Optionally, you can now create additional warning scenes if you want to have multi-level warnings. Creating scenes for other HomeKit-enabled lamps is similar.
Setting up the rule in Eve is a equally easy. Select Scenes in the table bar and select the Rules > Add Rule tab. Here you select Add Trigger and under Device select Air Quality. If you use more than one Eve Room, they are listed here, activate the desired Eve Room. Choose here worse or equal to Inferior. Then the rule will trigger the scene, the air quality changes to inferior or worse. Now choose Continue and again Continue, we do not want to use conditions here. In the next step you select the scene that creates the red light and assign a name for the rule – done. For the rule to work reliably, a home hub is of course required.
If you want finer gradations, create another scene with the color orange and combine it with another rule that triggers worse or equal to Fair for air quality.
Then Eve Flare glows orange, if the air quality is fair or red, if it is inferior or worse. Of course you can also create rules that make an Eve Flare glow green, if the air quality will be good or better.