TY - JOUR AU - Seema Bhangar AU - Nasim A Mullen AU - Susanne V Hering AU - Nathan M Kreisberg AU - William W Nazaroff BT - Indoor Air DA - 01/2011 LA - eng PY - 2011 SP - 132 EP - 144. T2 - Indoor Air TI - Ultrafine particle concentrations and exposure in seven residences in northern California VL - 21 ER -