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Abstract Groups of guinea pigs were exposed to the thermal decomposition products (TDP) released from acrylonitrile butadiene styrene (ABS), polypropylene-polyethylene copolymer (CP), polypropylene homopolymer (HP), or plasticized polyvinyl chloride (PVC). In single 50-min exposures to the TDP, guinea pigs exhibited sensory irritation, coughing, and airways constriction. Significant decreases in respiratory...