Secondhand smoke levels in public building main entrances: outdoor and indoor PM2.5 assessment
Xisca Sureda, Jose M Martínez-Sánchez, María José López, Marcela Fu, Fernando Agüero, Esteve Saltó, Manel Nebot, Esteve Fernández
Tobacco Control Nov 2012, 21 (6) 543-548; DOI: 10.1136/tobaccocontrol-2011-050040