What is "shaokao"

Shaokao typically consists of heavily spiced, barbecued foods on skewers. It is available in almost all of the cities in China, and is a prominent dish in Beijing, China, where some restaurants set up food stalls outdoors to purvey the product. Concerns about food safety associated with shaokao and air pollution generated from outdoor shaokao vendors associated with increased smog levels in Beijing have prompted complaints about the vendors.