But not everyone is convinced that pizza-making is the true culprit. Local residents and pizza makers held a protest on Sunday in front of the town hall against the mayor's order. "We can't be the cause of the smog," said one, according a report in Corriere della Sera . "Naples has many more pizzerias than San Vitaliano but doesn't have the same pollution levels. It's clear that they don't want to pinpoint the real cause. This order is a very costly mistake for us."