The JTA reports,

Germany’s main Jewish organization lambasted an artist for filling a former synagogue with poison gas.
The installation is part of a trend of what some call “transgressive art” and others call an insult to the memory of Holocaust survivors. To protest what he calls the “banalization of Holocaust remembrance,” Spanish artist Santiago Sierra is pumping exhaust fumes from six cars into the former synagogue in Pulheim-Stommeln near Cologne. Visitors can enter the installation wearing gas masks on Sundays through April 30, except for Easter.
There reportedly were long lines of people waiting to enter on opening day.

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