Coal and cars?
Looks like it clears up quite quickly.
During covid, when car traffic went to almost 0, the air quality was also extremely bad. Its mostly coal in the houses plus some people are not even using coal in their heating systems
alt Hacker News
During covid, when car traffic went to almost 0, the air quality was also extremely bad. Its mostly coal in the houses plus some people are not even using coal in their heating systems