On a related note, I've been looking for a good sensor that is hopefully plug & play and reliable for integration with home assistant. Is something like https://www.banggood.com/Geekcreit-Nova-PM-Sensor-SDS011-Hig... really the best way to go about it rather than an Awair? Would be keen on VOCs and CO2 as well.

edit: Looks like esphome with the following low-cost sensors is the way to go: * MH-Z19 for co2 (or CCS811 CO_2 for VOCs as well) * SDS011 for particle counts