AFAIK it's not that kerosene per se is such a poor-burning fuel.
Kerosene is heavily subsidized, so that poor people can afford to cook. So gas stations blend in the cheap kerosene into the gasoline. The effect is that it lowers the octane, so the engines need to be detuned compared to what we might be used to in the West. And since modern engines are pretty finely tuned and finicky, might well be that detuning them causes an increase in emissions.
Also, I think the pollution comes more from lots of old and poorly maintained vehicles with little or no pollution abatement equipment like catalytic converters.
Kerosene is heavily subsidized, so that poor people can afford to cook. So gas stations blend in the cheap kerosene into the gasoline. The effect is that it lowers the octane, so the engines need to be detuned compared to what we might be used to in the West. And since modern engines are pretty finely tuned and finicky, might well be that detuning them causes an increase in emissions.
Also, I think the pollution comes more from lots of old and poorly maintained vehicles with little or no pollution abatement equipment like catalytic converters.