5 ms·
I thought it was a central source of coal heating, but if it's in every home, it's probably too difficult to filter then.
by Kayou 9y ago
I thought it was a central source of coal heating, but if it's in every home, it's probably too difficult to filter then.
- seanmcdirmid 9y agoIn city heating is typically central, in then countryside it is by home. When I visited Tianjin in 1999, however, the apartment I was staying at had a coal furnace.