A calibration of the filter-paper method of estimation of smoke

Abstract

During a period of high pollution in December 1962 smoke samples were taken on Whatman cellulose fibre paper and on glass fibre paper, and the weight collected on the latter was used to derive a calibration curve for the standard filter-paper method of estimation of smoke. While the samples from which the calibration was derived were being collected the nature of the pollution changed very little, but qualitative changes in pollution may result from altered weather conditions and the errors which this introduces are considered. The effects which the texture of the paper and the colour and overlapping of the particles may have on the measured reflectance are also discussed.