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  • Title: Secondhand smoke levels in Scottish pubs: the effect of smoke-free legislation.
    Author: Semple S, Creely KS, Naji A, Miller BG, Ayres JG.
    Journal: Tob Control; 2007 Apr; 16(2):127-32. PubMed ID: 17400951.
    Abstract:
    OBJECTIVE: To compare levels of particulate matter, as a marker of secondhand smoke (SHS) levels, in pubs before and 2 months after the implementation of Scottish legislation to prohibit smoking in substantially enclosed public places. DESIGN: Comparison of SHS levels before and after the legislation in a random selection of 41 pubs in 2 Scottish cities. METHODS: Fine particulate matter <2.5 microm in diameter (PM2.5) was measured discreetly for 30 min in each bar on 1 or 2 visits in the 8 weeks preceding the starting date of the Smoking, Health and Social Care (Scotland) Act 2005 and then again 2 months after the ban. Repeat visits were undertaken on the same day of the week and at approximately the same time of the day. RESULTS: PM2.5 levels before the introduction of the legislation averaged 246 microg/m3 (range 8-902 microg/m3). The average level reduced to 20 microg/m3 (range 6-104 microg/m3) in the period after the ban. Levels of SHS were reduced in all 53 post-ban visits, with the average reduction being 86% (range 12-99%). PM2.5 concentrations in most pubs post-ban were comparable to the outside ambient air PM2.5 level. CONCLUSIONS: This study has produced the largest dataset of pre- and post-ban SHS levels in pubs of all worldwide smoke-free legislations introduced to date. Our results show that compliance with the Smoking, Health and Social Care (Scotland) Act 2005 has been high and this has led to a marked reduction in SHS concentrations in Scottish pubs, thereby reducing both the occupational exposure of workers in the hospitality sector and that of non-smoking patrons.
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