Chiming in as I had the thread bookmarked. The Netatmo indoor weather station can track CO2 levels and the Flow by PlumeLabs can do PM2.5, PM10, NO2 and VOC. 
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Chiming in as I had the thread bookmarked. The Netatmo indoor weather station can track CO2 levels and the Flow by PlumeLabs can do PM2.5, PM10, NO2 and VOC.