When I encounter someone complaining about catalytic converters I wonder what air they breath. In 1965, in the SF Bay area, I and friends had to stop playing tennis because our lungs and chests hurt so badly from the smog. I prefer having catalytic converters and being able to exercise outdoors to having no catalytic converters and staying inside because it is too painful breathing outdoors. Possibly those that remove the catalytic converters from their cars have the little oxygen bottle breathers with them.
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