Particles like PM2.5 and CO2 are the most common pollutants that reach high levels indoors. PM2.5 is one of the most dangerous pollutant because with its small size it can be absorbed into the blood causing adversive effects in organs. When running air purifiers to reduce PM2.5 concentrations you normally keep windows closed. This however can lead to very high CO2 concentrations -especially in a classroom with many children. Our comprehensive monitoring solution gives you insights on how to keep a healthy classroom air, balancing keeping both, particles and CO2 in a healthy range.