A great fire consumes much of the…
April 1845 CE
Iron manufacturing has developed in the city, and has come to represent a quarter of its industrial output.
The furnaces driving Pittsburgh’s iron and glass industries have filled the air with coal dust and soot.
Other industries release flour dust and cotton fibers into the air, contributing to a particularly incendiary mix of dust to settle on the city.
In addition, the seasonal weather has deprived the city of rain for six weeks, leaving the reservoir "dangerously low," while frequent near-gale-force winds from the west hit the city at mid-day, leaving Pittsburgh primed for the disaster.