BS 1747-11:1993, ISO 9835:1993

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Methods for measurement of air pollution. Determination of a black smoke index in ambient air|Air pollution, Particulate air pollutants, Soot, Smoke, Blackening index, Pollution, Determination of content, Filtration, Stain tests, Reflection factor, Optical measurement, Mathematical calculations, Sampling equipment, Test equipment, Sampling methods, Precision, Calibration, Accuracy, Conversion (units of measurement)

112 GBP