Journal of Advances in Medicine and Medical Research

Aims: To determine the lung function of cleaners exposed to particulate matter of aerodynamic diameter less than 2.5 micrometer (PM2.5) in the streets and offices in Lusaka, Zambia.

Study Design: This was a cross sectional study between two groups.

Place and Duration of Study: Lusaka city, central business area, between June and August 2014.

Methodology: The study included women between 18-50 years of age who had been working as street or office cleaners for 6 months or more. Males and individuals in both groups who used to smoke or were currently smokers, as well as those with a history of respiratory related illnesses or had cardiopulmonary conditions were excluded from the study. The cleaners were interviewed to get information on socio-demographic characteristics and other information using a structured interview schedule. The participants’ lung volumes, forced expiratory volume in one second (FEV₁), forced vital capacity (FVC) and their ratio (FEV₁/FVC) were measured using a MRI spirobank G spirometer. On the day of the interview, PM_2.5 in their work environment was sampled using a personal aerosol monitor (SIDEPAK AM510).  

Results: Out of the 90 participants, 45 were street sweepers and 45 were office cleaners. More street sweepers had impaired lung function (FEV1/FVC) 15(75%) than office cleaners 5(25%) p=0.01. FEV₁ was also significantly different among street sweepers 12(70.6%) and office cleaners 5(29.4%) p=0.05. PM_2.5 measurements revealed significantly high levels of exposure among street sweepers (p=0.001). Participants with impaired lung function (p=.005) and those with reduced FEV₁percent predicted were exposed to significantly high concentrations of PM_2.5 (p=0.012).

Conclusion: Exposure to high PM_2.5 concentration is associated with pulmonary function impairment and reduced FEV₁ % predicted among cleaners.