%0 Journal Article %A Seema Bhangar %A Nasim A Mullen %A Susanne V Hering %A Nathan M Kreisberg %A William W Nazaroff %B Indoor Air %D 2011 %G eng %N 2 %P 132-144. %R 0.1111/j.1600-0668.2010.00689.x %T Ultrafine particle concentrations and exposure in seven residences in northern California %V 21 %8 04/2011