Smog story (California Institute of Technology), 1950

Caption slip reads: "Photographer: Hecht. Date: 11-17. Reporter: Harrison. Assignment: Smog story -- Caltech. 17: Doctor A.J. Haagen-Smit holds inflated toy balloon in stream of ozone-hydrocarbon fumes. Oxidation of rubber caused it to burst in a few seconds. 142-143: In his laboratory, Doctor A.J. Haagen-Smit produces one of the commonest kinds of smog product of ozone and hydrocarbons".

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