I second Plantower (I've only used a few PMS7003), it allows you to build a really high quality sensor while being really a beginner project using some arduino and LCD. Note that this is only for particulates in the air.
Btw, why thousands? And any reasons for not using CCS811 for TVOC and HDC1080 for temp while you're at it? Sounds like you have tons of experience and it's not easy to find reviews which properly test these.
Btw, why thousands? And any reasons for not using CCS811 for TVOC and HDC1080 for temp while you're at it? Sounds like you have tons of experience and it's not easy to find reviews which properly test these.