Before revision: History Smokestacks were first used during industrial revolution between the 18th century and 19th centuries and were known to foul the airs in most larger cities but were most noted in large industrial centers like Manchester England or Pittsburgh Pennsylvania.
After revision: History Smokestacks were first used during Industrial Revolution between the 18th century and 19th centuries and were known to foul the airs in most larger cities but were most noted in large industrial centers like Manchester England or Pittsburgh Pennsylvania.