As far as the smog goes that was before catalytic converters and improved laws to reduce smog
Then take into account modern nuclear reactors, as other commenters said. Nuclear is the way to go for safest and cleanest energy of all energy sources we have. Things that are stopping it are coal/oil lobby, nuclear scare and capitalists and politicians scared other countries might make nuclear bomb out of it.
I'd love to have a nuclear powerplant in my country, we are choking here because of coal and coal lobby just makes things worse by supporting energy sources sold as "renewable clean sources" that need batteries to work on and as a fallback, when there is less sun or wind always go back to coal.
What ? One poster in comments said they are getting power from reactor that is same model as Chernobyl one with added improvments and nothing bad happened, I don't get what you mean by "when they're in production" ?
Are you arguing that coal is safer than nuclear ?