Filter/dilution tunnel. A smoke sample is drawn via a tube where it is diluted with air, the ensuing smoke/air mixture is then pulled by way of a filter and weighed. This can be the internationally identified technique of measuring smoke from combustion.[sixty six] The map earlier mentioned, dependant on https://top-agency-in-china60268.wikirecognition.com/1330509/an_unbiased_view_of_smoke