I have an IQ Air filter system on each floor - quality stuff if needed. For temperature and humidity, I don't know how accurate they really are but I have a 3 pack of Doqaus indoor digital ...

With its built-in sensor, HomePod can detect and tell you the temperature and humidity of the room. And you can set it in automations so the blinds close if the temperature hits 80 degrees.

A research team develops a real-time humidity sensing optical sensor. The response time of the new sensor is 10,000 times faster than the conventional sensors and can be mass-produced at low cost.

Hub M2 - $57.99 (currently out of stock but expected to return soon) Temperature and Humidity Sensor - $19.99 (currently out of stock but expected to return soon) ...