Assertion: carbon monoxide | /r/HasProperty | given off increase
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text: Carbon monoxide is a toxic gas that you cannot see or smell, CO is given off whenever fuel or other carbon-based materials are burned, vehicle emissions increase unhealthful ambient CO concentrations, but with the introduction of emissions controls, particularly automotive catalysts, estimated CO emissions from all sources decreased by 21%, The locations that continue to have high concentrations of CO contain high pollution.