Descriptors | Air pollution, Pollution, Dust, Industrial air pollutants, Grit, Particulate air pollutants, Gases, Ducting, Pipes, Combustion products, Sampling equipment, Sampling methods, Test equipment, Accuracy, Precision, Contaminants, Rectangular shape, Circular shape, Weight measurement, Weight (mass), Exhaust gases, Flues, Chimneys, Sample location |