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pH measurements on sludge of particulate carbonaceous materials and ash were made with a vacuum tube potentiometer amplifier. Dust, precipitated out of flue gas of industrial fuel burning plants through the use of the series impinger, gives pH values of sludge in the range 2.5 to 5. Sludge of ash of coal used in these tests gives pH values in the range 7 to 11.5, depending upon the seam and locality in which the coal is mined. The results of this study may aid the ``fingerprinting'' of dust, responsible, in part, for atmospheric pollution in American cities.