Final answer:
The difference in emissions between the two plants is most likely due to the use of a catalytic converter.
Step-by-step explanation:
The difference in emissions between the two plants is most likely due to the use of a catalytic converter to reduce carbon monoxide emissions.
Catalytic converters are designed to reduce toxic emissions produced by burning gasoline in internal combustion engines.
They utilize catalytically active metals to promote complete combustion of carbon-containing compounds, resulting in the production of carbon dioxide and the reduction of nitrogen oxides.