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Why is a generator, that's basically a single small engine, producing as much pollution as several cars? Why hasn't something been done to fix that?

A: cars have catalytic converters to reduce their emissions B: generators don't have catalytic converters as standard because cats are expensive and unlike cars, generators aren't commonly used enough to significantly effect global emisions.

It's because of incomplete Combustion and the lack of a Catalytic Converter

So, why aren't they required to have catalytic converters?

Not saying the amount of carbon monoxide they produce isn't dangerous, it is, but: "can produce as much carbon monoxide as hundred of midsized cars" By what mechanism is that possible other than magic?

Just a guess, but I think cars are required to reduce emissions in a way generators aren’t. So maybe they used “produce” when they really meant “emit.”

Just the magic of engineering via catalytic converters.

Do they sell catalytic converters for generators?

It would require them to have 100 percent efficiency, which, they do not.

the magic mechanism is incomplete combustion which generates carbon monoxide modern car engines have a very low rate of incomplete combustion while these simple generator engines are prone to relative high rate of incomplete combustion

even factoring in incomplete combustion, do you think that outweighs the emissions from hundreds of cars, especially when those cars burn fuel at a higher rate than a single cylinder generator such as the on pictured? Keep in mind, best case scenario, the catalytic converters are only 95% efficient.

They don't have Catalytic Converters (Carbon Monoxide is a product of Incomplete Combustion)