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Citation

Ferdous T, Siddiqi K, Semple S, Fairhurst C, Dobson R, Mdege N, Marshall A, Abdullah SM & Huque R (2022) Smoking behaviours and indoor air quality: a comparative analysis of smoking-permitted versus smoke-free homes in Dhaka, Bangladesh. Tobacco Control, 31 (3), pp. 444-451. https://doi.org/10.1136/tobaccocontrol-2020-055969

Abstract
Introduction Exposure to secondhand smoke (SHS) is a health risk to non-smokers. Indoor particulate matter (PM2.5) is associated with SHS exposure and is used as a proxy measure. However, PM2.5 is non-specific and influenced by a number of environmental factors, which are subject to geographical variation. The nature of association between SHS exposure and indoor PM2.5—studied primarily in high-income countries (HICs) context—may not be globally applicable. We set out to explore this association in a low/middle-income country setting, Dhaka, Bangladesh. Methods A cross-sectional study was conducted among households with at least one resident smoker. We inquired whether smoking was permitted inside the home (smoking-permitted homes, SPH) or not (smoke-free homes, SFH), and measured indoor PM2.5 concentrations using a low-cost instrument (Dylos DC1700) for at least 22 hours. We describe and compare SPH and SFH and use multiple linear regression to evaluate which variables are associated with PM2.5 level among all households. Results We surveyed 1746 households between April and August 2018; 967 (55%) were SPH and 779 (45%) were SFH. The difference between PM2.5 values for SFH (median 27 ?g/m3, IQR 25) and SPH (median 32 ?g/m3, IQR 31) was 5 ?g/m3 (p

Keywords
low/middle income country; second-hand smoke; environment; global health; socioeconomic status

Journal
Tobacco Control: Volume 31, Issue 3

• Accepted manuscript