title: UK smoke-free legislation: changes in PM2.5 concentrations in bars in Scotland, England, and Wales.
abstract: OBJECTIVE
  Evaluate the effect of smoke-free legislation on fine particulate [particulate matter <2.5 microm in diameter (PM(2.5))] air pollution levels in bars in Scotland, England, and Wales.
  
  
  METHODS
  Air quality was measured in 106 randomly selected bars in Scotland, England, and Wales before and after the introduction of smoking restrictions.
  
  
  METHODS
  PM(2.5) concentrations were measured covertly for 30-min periods before smoke-free legislation was introduced, again at 1-2 months post-ban (except Wales) and then at 12-months post-baseline (except Scotland). In Scotland and England, overt measurements were carried out to assess bar workers' full-shift personal exposures to PM(2.5). Postcode data were used to determine socio-economic status of the bar location.
  
  
  RESULTS
  PM(2.5) levels prior to smoke-free legislation were highest in Scotland (median 197 microg m(-3)), followed by Wales (median 184 microg m(-3)) and England (median 92 microg m(-3)). All three countries experienced a substantial reduction in PM(2.5) concentrations following the introduction of the legislation with the median reduction ranging from 84 to 93%. Personal exposure reductions were also within this range. There was evidence that bars located in more deprived postcodes had higher PM(2.5) levels prior to the legislation.
  
  
  CONCLUSIONS
  Prior to legislation PM(2.5) concentrations within bars across the UK were much higher than the 65 microg m(-3) 'unhealthy' threshold for outdoor air quality as set by the US Environmental Protection Agency. Concentrations in Scottish and Welsh bars were, on average, two or more times greater than in English bars for which seasonal influences may be responsible. Legislation in all three countries produced improvements in indoor air quality that are consistent with other international studies.
authors.affiliation: Scottish Centre for Indoor Air, Liberty Safe Work Research Centre, Population Health Sciences, University of Aberdeen, Aberdeen AB25 2ZP, UK. sean.semple@abdn.ac.uk
authors.forename: Sean
authors.initials: S
authors.lastname: Semple
authors.forename: Martie
authors.initials: M
authors.lastname: van Tongeren
authors.forename: Karen S
authors.initials: KS
authors.lastname: Galea
authors.forename: Laura
authors.initials: L
authors.lastname: MacCalman
authors.forename: Ivan
authors.initials: I
authors.lastname: Gee
authors.forename: Odette
authors.initials: O
authors.lastname: Parry
authors.forename: Audrey
authors.initials: A
authors.lastname: Naji
authors.forename: Jon G
authors.initials: JG
authors.lastname: Ayres
mesh_terms: D016902:Air Pollution, Indoor / Q000032:analysis* / Q000706:statistics & numerical data; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D006801:Humans; D016273:Occupational Exposure / Q000032:analysis / Q000517:prevention & control / Q000706:statistics & numerical data; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D015397:Program Evaluation; D012111:Residence Characteristics / Q000706:statistics & numerical data; D012147:Restaurants; D012621:Seasons; D012907:Smoking / Q000331:legislation & jurisprudence*; D000074606:Smoking Prevention; D012959:Socioeconomic Factors; D013997:Time Factors; D014028:Tobacco Smoke Pollution / Q000032:analysis* / Q000331:legislation & jurisprudence / Q000706:statistics & numerical data; D006113:United Kingdom
chemical_list: D052638:Particulate Matter; D014028:Tobacco Smoke Pollution