Environmental Health Perspectives, Jun. 2014, by Nate Seltenrich.
http://ehp.niehs.nih.gov/122-a154/

"Researchers now understand that the process of cooking food and even simply operating stoves—particularly gas appliances—can emit a cocktail of potentially hazardous chemicals and compounds. Within our homes, these pollutants are less diluted than they are outdoors, and in the absence of proper ventilation, they often are trapped inside."

Includes a discussion of the kitchen ventilation requirements in ASHRAE 62.2.