Second-hand smoke in hospitals in Catalonia (2009): a cross-sectional study measuring PM2.5 and vapor-phase nicotine.

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To describe second-hand smoke in the hospitals of the Catalan Network for Smoke-free Hospitals using Particulate Matter (PM(2.5)) and to assess the association between second-hand smoke exposure in main entrances (outdoors) and halls and between PM(2.5) and airborne nicotine concentrations.