Monitoring nano particles to sizes as low as 10 nm the Partector uses a diffusion charge technology to detect particles too small for optical or mass based methods. The output is in lung deposited surface area (LDSA) in m2/cm3. This is an important property of these small particles as its thought that they transport toxins on their surface deep into the lung and bloodstream. The particles are so small they have little measurable mass so by inducing an electrical charge on their surface and subsequently detecting that charge we can detect their presence and determine their surface area. Partector is battery operated and can be used as a fixed or portable monitoring system.