Combined optical procedures. There are actually different proprietary optical smoke measurement devices like the 'nephelometer' or maybe the 'aethalometer' which use several diverse optical strategies, which include multiple wavelength of sunshine, inside of one instrument and use an algorithm to offer a superb estimate of smoke. 1600 – Tobacco https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/