I have a Airgradient One (indoor) and a Airgradient Open air (outdoor) and love them. They are Esp boards with esphome configs available. They use readily available component that makes sensors easy to replace when they wear out or loose accuracy over time.

The whole project is open and you can buy the DIY kit and build it yourself or buy a prebuilt one.

https://www.airgradient.com/

One more Air Gradient user here. They just work with HA now. No need to change firmware or anything.

I made my own 5 years ago, it's still going great. Esp32 + particulate sensor + voc sensor + esphome. I do wish I had splurged and gone c02 instead of voc or in addition. It was like 1/3 the price at the time of the normal brands.

Go here and select "air_quality" from the exposes dropdown.

https://www.zigbee2mqtt.io/supported-devices/

https://apolloautomation.com/products/air-1?srsltid=AfmBOooZOUo5dJeWfkwa471P1diFEtr1z3yHEI_MPs9Qp8L-H5kzOVMe

This guy makes some great stuff, but these are wifi iirc.

I use airthings Wave plus, but they're for inside and you need btproxy/esphome (cheap and well supported) for the connection