Mobile food canteens have become popular in the Baton Rouge area and have caused problems in China. Smoke from the barbecue stands are a common source of unhealthy airborne particulate matter known as PM2.5. A spokesman from Beijing's Bureau of City Administration and Law Enforcement insists the "stands" not only create serious air pollution but enhance noise pollution for neighborhoods. Unlicensed grill operators were facing fines of up to 5,000 yuan or about $815 and the confiscation of their grilling equipment for discharging smoke and noise. China's microblogging service, Sina Weibo, believes the crackdown was the government's attempt to harass and limit vendors. The most smoke is caused by specific trucks that serve mutton skewers. Yum!