Cheshire chemical company Ineos is supplying dozens of emergency lorry loads of white salt to authorities including Gloucestershire, Bradford and East Riding of Yorkshire.
Preeminent international contemporary art gallery White Cube will be showing US abstract artist Mark Bradford and Mexican conceptual artist Gabriel Orozco, among others.
But Professor Paul Rogers, of the University of Bradford's department of peace studies, said white phosphorus could be considered a chemical weapon if deliberately aimed at people.