Mixed optical solutions. You'll find many proprietary optical smoke measurement units including the 'nephelometer' or the 'aethalometer' which use numerous diverse optical solutions, which include multiple wavelength of sunshine, inside one instrument and apply an algorithm to provide a superb estimate of smoke. DNA. Arsenic, nickel and radioactive polonium https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/