Objectives: The Korean government implemented a smoke-free regulation for pubs with a net indoor area of ≥100 m 2 on January 1, 2014. The purpose of this study was to determine the indoor levels of concentrations of particulate matter smaller than 2.5 μm (PM
2. 5) in implemented and non-implemented pubs in Seoul and Changwon. concentrations was observed in implemented and non-implemented pubs with smokers. Strict implementation of the regulation in all pubs is needed for better indoor air quality.
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