According to an article in the Akron Beacon Journal [ed update: Article now archived and needs registration for access], extremely high particle levels over 2,000 μg m^-3 have been recorded in a bar in Ohio. Mark Travers of the Roswell Park Cancer Institute, who is an expert in measuring secondhand smoke levels, called it "the single most polluted bar we've seen in the U.S". Many states around the country are starting to enact bans on smoking in indoor workplaces to protect workers.

What conditions might lead to the observed particle levels? Try to simulate them using the new bar and restaurant model.