Was asbestos used in the construction of The World Trade Center?

Asbestos was widely used in the construction of the first of the towers of the World Trade Center to be built. It was being phased out when the second tower was being constructed and was not used in most of the second tower. Substantial removal projects had been completed, and both towers were essentially free of asbestos containing fireproofing on steel, long before the attacks of 2001 caused the towers to collapse.

While some people incorrectly believe that the buildings would still be standing if asbestos fire proofing on the steel had been used throughout and had not been removed, it is important to understand that fireproofing materials free of asbestos were applied when the asbestos type was not used or was removed. And the fireproofing was blasted off the steel by the initial impact and explosions. So the presence or absence of asbestos had no impact on the survival of the building. It did impact the environmental conditions in lower Manhattan after the buildings collapsed.