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Impact of Home Ventilation Assessment on Indoor Air Quality Practices among Urban Households in Nigeria

Abstract

Indoor air quality is an important environmental and public health concern because inadequate ventilation may contribute to the accumulation of indoor air pollutants and increase the risk of respiratory and other health problems. Urban households in Nigeria may be exposed to indoor pollutants from cooking activities, generators, tobacco smoke, household chemicals, dust, mould, combustion sources, and outdoor air pollution entering poorly ventilated buildings. Inadequate ventilation, overcrowding, blocked air openings, and limited awareness of appropriate ventilation practices may further worsen indoor air conditions. Home ventilation assessment provides an opportunity to identify ventilation-related problems and provide households with information on measures that may improve indoor air quality. Against this background, this study investigates the impact of home ventilation assessment on indoor air quality practices among urban households in Nigeria. The study will be anchored on the Health Belief Model, Social Ecological Model, and Theory of Planned Behavior. The Health Belief Model explains how household members' perceptions of susceptibility to health problems associated with poor indoor air quality, perceived severity, perceived benefits of adequate ventilation, perceived barriers, and cues to action may influence household practices. The Social Ecological Model emphasizes the influence of individual, household, housing, community, environmental, socioeconomic, and policy factors on indoor air quality. The Theory of Planned Behavior explains how attitudes toward ventilation practices, perceived social expectations, and perceived behavioural control may influence household intentions and behaviours concerning indoor air quality. Collectively, these theoretical perspectives provide a suitable framework for explaining how home ventilation assessment may influence indoor air quality practices among urban households in Nigeria. The study will adopt a quantitative quasi-experimental or analytical cross-sectional research design. The study population will comprise households residing in selected urban communities across Nigeria, with eligible respondents being adults responsible for household health and environmental decisions. A multistage sampling technique will be used to select geopolitical zones, states, urban local government areas, communities, neighbourhoods, households, and eligible respondents. Home ventilation assessment will be measured using indicators such as assessment of the number and size of windows and vents, availability of cross-ventilation, airflow pathways, room occupancy, cooking-area ventilation, generator placement, presence of mould or dampness, blocked ventilation openings, indoor combustion sources, ventilation of sleeping areas, and household awareness of ventilation-related risks. Indoor air quality practices will be assessed using indicators such as opening windows or vents appropriately, maintaining unobstructed ventilation openings, ensuring adequate ventilation during cooking, keeping combustion sources away from living spaces, avoiding indoor generator operation, reducing indoor tobacco smoke, controlling household dust, addressing dampness and mould, maintaining cooking appliances, improving airflow in crowded rooms, and adopting appropriate measures to reduce indoor pollutant accumulation. Data will be collected using structured questionnaires, home ventilation assessment checklists, environmental observation tools, indoor air-quality practice assessment instruments, and pre-test and post-test assessments where a quasi-experimental intervention is adopted. Where resources permit, selected indoor environmental indicators such as carbon monoxide, particulate matter, temperature, humidity, or other relevant measures may also be assessed using appropriate monitoring equipment. Descriptive statistics will be used to summarize household demographic and housing characteristics, ventilation conditions, indoor pollution sources, and indoor air quality practices. Inferential statistical techniques, including chi-square tests, t-tests, correlation analysis, and logistic or multiple regression analysis where appropriate, will be used to determine the impact of home ventilation assessment on indoor air quality practices. Where a quasi-experimental design is adopted, practice scores before and after the ventilation assessment and educational intervention may be compared with those of a comparison group to determine changes associated with the intervention. Diagnostic tests will also be conducted to assess the reliability, validity, and robustness of the findings. The study is expected to find that home ventilation assessment has a significant positive impact on indoor air quality practices among urban households in Nigeria. Households that receive structured ventilation assessments and appropriate guidance are expected to demonstrate improved practices for maintaining adequate airflow and reducing indoor pollutant exposure compared with households without comparable assessment. Assessment may help household members identify blocked ventilation openings, inadequate cross-ventilation, poorly ventilated cooking areas, inappropriate generator placement, indoor combustion sources, dampness, and other conditions that may negatively affect indoor air quality. Practical recommendations may encourage households to improve natural ventilation, maintain unobstructed openings, ventilate cooking areas appropriately, reduce indoor combustion, and address dampness and mould. However, overcrowded housing, high urban population density, poor building design, security concerns associated with open windows, inadequate housing infrastructure, high energy costs, and financial limitations may reduce households' ability to implement recommended improvements. The study therefore expects accessible, practical, household-specific ventilation assessment and education, supported by improved housing conditions and environmental health policies, to contribute significantly to improved indoor air quality practices among urban households in Nigeria. The study is expected to contribute to the literature on indoor air quality, household ventilation, environmental health, housing and health, respiratory health prevention, household environmental practices, health education, urban health, and public health in Nigeria. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, Federal Ministry of Environment, Federal Ministry of Housing and Urban Development, state ministries and environmental health agencies, local government authorities, environmental health officers, housing professionals, primary healthcare providers, public health practitioners, community health workers, development partners, and policymakers regarding strategies for improving household indoor environments. The study will also provide evidence-based recommendations for strengthening home ventilation assessment, increasing household awareness of indoor air-quality risks, promoting appropriate ventilation practices, improving building ventilation standards, addressing household combustion sources, strengthening environmental health inspections, and developing sustainable indoor air-quality interventions for urban households across Nigeria.

Keywords: Home ventilation assessment, indoor air quality practices, urban households, household ventilation, environmental health, indoor air pollution, housing and health, respiratory health prevention, health promotion, Nigeria, public health.