They are shooting the Hairspray musical movie in Toronto instead of Baltimore, to take advantage of tax breaks and other benefits of shooting a film north of the border. While the article reports that some shooting will take place in Baltimore, it seems they have now decided simply to recreate Baltimore on a sound stage.
Baltimore is just as much of a character in this story as Tracy Turnblad or Penny Pingleton. John Waters seems to take the filming location change in stride, even though he was a staunch believer in making Baltimore prominent in the settings of most of his movies. It's all about the money these days.
This should be a wake up call to the film industry in the U.S., which needs to institute a few incentives to keep film crews from crossing the borders.