Smoke-free prisons in England: indoor air quality before and after implementation of a comprehensive smoke-free policy

Objectives High levels of particulate pollution due to secondhand smoke (SHS) have previously been recorded in English prisons. As part of an evaluation to ascertain whether a new comprehensive smoke-free policy introduced in the first four prisons in England was successfully implemented, this study compares indoor air quality on prison wing landing locations three months before and three months after going smoke-free. Design An indoor air quality monitoring study, comparing SHS levels before and after a comprehensive smoke-free prison policy. Setting The first four prisons in England to implement a comprehensive smoke-free policy. Primary and secondary measures We compared concentrations of airborne particulate matter