Title: Monitor for atmospheric pollutants

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Abstract: Apparatus for monitoring the mass concentration of atmospheric pollutants above and below a predetermined size. A receptacle has an air inlet and outlet. Air is continuously drawn through the inlet and thence through the receptacle and the outlet. A first collector in the receptacle collects pollutants above the predetermined size. This first collector is movable through a first station and collects pollutants above the predetermined size from the air entering the receptacle through the inlet on successive areas thereof. A second collector in the receptacle collects pollutants below the predetermined size. This second collector is movable through a second station and collects pollutants below the predetermined size from the air which has passed the first station on successive areas thereof. A holder is provided for a first source of radiation which passes through the area of the first collector at the first station. A detector detects radiation from the first source passing through the area of the first collector. A holder is provided for a second source of radiation which passes through the area of the second collector at the second station. A detector detects radiation from the second source passing through the area of the second collector. Periodically operating the collectors, moves the pollutant-bearing areas thereof away from the stations and brings fresh areas for collection of pollutants into position at the stations. The collectors dwell between successive operations thereof. Instrumentation responsive to the first and second detectors indicates the mass concentration of pollutants above and below the predetermined size for each dwell period between the successive operations of the collectors.


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