Particulates/ aerosols are probably the most dangerous components of poor quality air. We now know that the size and composition of these particulates determine their toxicity. Designed by aerosol scientists and engineered by Alphasense, these OPCs have been extensively tested in both clean and high pollution urban environments and are increasingly being used in industrial environments. The OPC-N3 alphasense Dust and Particles monitor can measure from clean rooms to pollution levels of 2,000 μg/m3 (PM2.5) with the unique feature of being able to measure pollen.