[werk_ag]

There should be a reason why brands like Davis, Purple Air and others don't put the T/H sensor outside the box or even too exposed...

Almost everywhere, I find this misunderstood about the role of the Temp / Hum sensors on air quality measurement devices. They aren't there to provide precise readings of the outdoor temperature / humidity. They are there to provide Temp / Hum data as seen by the Dust Sensor, and to allow the software to do the required corrections, specially against the %RH. That's why the T/H sensor should be placed near to the dust sensor, ideally in the air intake path.