Research on two air-injection stove designs from the Cookstoves Group at LBNL has recently been accepted for publication in Environmental Science and Technology. This paper investigates the effect of air injection on cooking performance, PM and gaseous emissions, and PM size distribution and number concentration. Although air injection can decrease total PM mass emitted, it is unclear if it reduces the number concentration of all PM emission sizes uniformly or concurrently increase the number of ultrafine particles per mass of fuel burned, which may be more harmful to human health. A copy of the paper can be found here or under Publications.