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Table 1 Prison facility characteristics

From: Second-hand smoke in four English prisons: an air quality monitoring study

  Category and functiona Structural design Roll count Wings Smoke-free wings Sampled
HMP 1 Female
Built 1960s. Mix of original, T-shaped and quick build wings 262 7 Mother & Baby Unit July 2014
HMP 2 Male
Category C Training
Built 1960s. Mix of triangular, T-shaped and quick build wings 494 8 Care & Separation Unit August 2014
HMP 3 Male
Category B
Built 1850s. Victorian radial design 533 7 Healthcare August 2014
HMP 4 Male
Category B
Built 1992. Bullingdon design, with additional mix of wings 1215 9 Healthcare &
1 Smoke-Free Spur
October &
November 2014
  1. aCategory B prisons hold prisoners for whom the very highest conditions of security are not necessary but for whom escape must be made very difficult
  2. aCategory C prisons hold prisoners who cannot be trusted in open conditions but who do not have the resources and will to make a determined escape attempt
  3. aFemale closed prisons can hold category A, B, C prisoners. Due to the smaller female prisoner population, female establishments are categorised into either ‘closed’ or ‘open’
  4. aLocal prisons serve the courts and receive remand and post-conviction prisoners prior to their allocation to other establishments
  5. aTraining prisons hold sentenced prisoners who tend to be employed in a variety of activities such as prison workshops, education and in offending behaviour programmes