But 8 million people per year are killed by particulate emissions from normally-operating fossil and biofuel combustion plants. Nuclear, wind, solar, and hydro are all orders of magnitude safer ways, per TWh generated, than the dominant worldwide sources. Therefore we should replace fossil and biofuel with nuclear, wind, solar, and hydro.
Conveniently, those 4 are also very low carbon, so they prevent climate change along the way.
[1] https://www.who.int/health-topics/air-pollution#tab=tab_1
But of course we should replace fossils by renewables and phase them out before nuclear. And if nuclear wouldn't take too long to build building new nuclear plants as a stopgap may actually make sense. Unfortunately, they do.