And bear in mind, not everyone had electricity, not to speak of central heating. You had lots of chimneys everywhere.
LMAO is this most houses where I live in New Zealand. Smoke coming out of chimneys for people to keep warm, often burning coal. They have electricity of course but it's too expensive to heat their houses.
In remote Alaska it's the same way (though more commonly with wood than coal). When the temperature gets low enough, the smoke doesn't rise either, so air quality in villages (and even cities like Fairbanks sometimes) can get pretty terrible waiting for a storm to come flush it away.
It’s a matter of degree. It all adds up. Surely you’ve heard of the great smog in London? That’s an extreme example but all major cities had appalling air pollution. Bad air alone killed untold numbers of people every year.
Christchurch has smog every winter.
But yeah, just pointing out how backward my country is. Maybe we'll reach 1940s US smog levels eventually.