An artificial fog created as part of an installation at Tate Modern has sparked concern. “A chemical haze created for Olafur Eliasson’s spectacular apocalyptic installation, the Weather Project – which has provoked near-religious awe in the crowds flocking to see it in the museum’s Turbine Hall – is slowly creeping into the galleries. Attendants, who have to spend from eight to 12 hours in the fug, claim they are becoming disorientated.”