| http://www.w3.org/ns/prov#value | - in some of these areas, they may not be. they improve local emissions, which is great for cities with airflow problems, but most american still live out in the country where the car density is low enough that people could run with catalytic converters and nobody would notice except maybe when they walked past an idling car. I am not recommending that cat's should not be required, just saying that an
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