Figure 2.

Air monitor system including modified Dylos particle sensor with four size bins ($>0.5\mathrm{\mu }\mathrm{m}$, $>1.0\mathrm{\mu }\mathrm{m}$, $>2.5\mathrm{\mu }\mathrm{m}$ and $>10\mathrm{\mu }\mathrm{m}$), temperature and relative humidity sensors, and a microcontroller.