As described in this topic I'm porting a DustDuino to LoRa.
There are a lot of air quality sensors and experiments around. Some of them are more successful than others and many failed, so I started with a literature study. This showed that a setup with a PPD42 sensor combined with some best practices gives a very acceptable result.
First results were very promising. During the next 2-3 weeks I will gradually expand this Labs recipe when my indoor test setup evolves to maturity.
Many thanks to Willie Shubert for his initial DustDuino design.