How to combine two automations for air purifier

[Troon]

@3jam3

Is it possible to use When a template triggers instead of the helper and insert the state template there? What is (will be) the difference?

A template trigger fires when the template changes from false to true:

Automation Trigger

So it’s not quite what you need here.

[3jam3]

@Troon

quite what you need

Thanks for the hint. Indeed, this is not what I need.
Hoping you still have a bit of patience for me, I will ask what I think is the last question. How do you mitigate the switching in boundary conditions, i.e. when the PM2.5 value fluctuates between, say, 29 and 31? I am leaving aside the issue of the fan, the buzzer is very annoying.

[Troon]

@3jam3

How do you mitigate the switching in boundary conditions, i.e. when the PM2.5 value fluctuates between, say, 29 and 31?

You could employ the for: feature in the state trigger, to only fire when it’s been in the same state for, say, 5 minutes.

[3jam3]

I will.
Many thanks, sincerely. Cheers!