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Influence of Household Indoor Air Quality Assessment on Respiratory Health Risk Detection among Rural Households in Nigeria

Abstract

Indoor air pollution is an important environmental and public health concern among rural households in Nigeria, particularly where solid fuels such as firewood, charcoal, crop residues, and other biomass fuels are used for cooking and heating. Poor ventilation, inefficient cooking stoves, indoor smoke, tobacco smoke, kerosene use, dust, and other household pollutants may contribute to poor indoor air quality and increase the risk of respiratory health problems. Prolonged exposure to indoor air pollutants may be associated with respiratory symptoms, asthma, chronic respiratory conditions, recurrent respiratory infections, and reduced respiratory well-being. However, respiratory health risks may remain undetected because of limited awareness, inadequate environmental health services, geographical barriers, financial constraints, and limited access to routine health assessment. Household indoor air quality assessment provides an opportunity to identify environmental conditions and pollutant exposures that may increase respiratory health risks within rural households. Early detection of these risks can facilitate household health education, improved ventilation, cleaner cooking practices, adoption of improved cookstoves, reduction of pollutant sources, and referral for clinical assessment where necessary. Against this background, this study investigates the influence of household indoor air quality assessment on respiratory health risk detection among rural households in Nigeria. The study will be anchored on the Environmental Health Theory, the Health Belief Model, and the Social Ecological Model. Environmental Health Theory emphasizes the relationship between environmental exposures and human health and supports the systematic assessment and control of environmental factors that may contribute to disease. The Health Belief Model explains how household members' perceptions of susceptibility to respiratory health problems, perceived severity, perceived benefits of indoor air quality assessment, perceived barriers, and cues to action may influence participation in household environmental health assessment. The Social Ecological Model emphasizes the influence of individual, household, community, socioeconomic, cultural, and environmental factors on cooking practices, household fuel use, ventilation, exposure to indoor pollutants, and respiratory health. Collectively, these theoretical perspectives provide a suitable framework for explaining how household indoor air quality assessment may influence respiratory health risk detection among rural households in Nigeria. The study will adopt a quantitative cross-sectional analytical or quasi-experimental research design. The study population will comprise rural households in selected communities across Nigeria, with eligible adult household members providing information on household characteristics, environmental exposures, and respiratory health risks. A multistage sampling technique will be used to select states, local government areas, rural communities, households, and eligible participants. Household indoor air quality assessment will be measured using indicators such as type of cooking fuel, cooking location, ventilation characteristics, stove type, duration and frequency of cooking, indoor smoke levels, presence of tobacco smoke, kerosene use, particulate matter exposure, carbon monoxide levels where feasible, household dust, and other relevant indoor environmental conditions. Respiratory health risk detection will be assessed using indicators such as persistent cough, wheezing, shortness of breath, chest discomfort, recurrent respiratory symptoms, asthma-related symptoms, exposure-related respiratory risks, household members requiring further clinical evaluation, newly identified respiratory health risks, referrals for healthcare assessment, and confirmed respiratory conditions where appropriate. Data will be collected using structured questionnaires, household environmental assessment forms, indoor air quality measurements, household observation checklists, healthcare records where available, and referral registers. Descriptive statistics will be used to summarize household characteristics, fuel-use patterns, ventilation conditions, indoor air quality measurements, respiratory symptoms, and patterns of respiratory health risk detection. Inferential statistical techniques, including chi-square tests, correlation analysis, and logistic or multiple regression analysis, will be used to determine the influence of household indoor air quality assessment on respiratory health risk detection. Where appropriate, respiratory health risk detection rates before and after implementation of household indoor air quality assessment and intervention activities may be compared to determine changes associated with the assessment. Diagnostic tests will also be conducted to assess the reliability, validity, and robustness of the findings. The study is expected to find that household indoor air quality assessment has a significant positive influence on respiratory health risk detection among rural households in Nigeria. Households participating in indoor air quality assessment are expected to have a higher likelihood of previously unrecognized environmental and respiratory health risks being identified than households without access to such assessment. Systematic assessment may identify households using polluting cooking fuels, poorly ventilated cooking areas, inefficient stoves, and other sources of indoor air pollution while also identifying household members experiencing respiratory symptoms requiring further evaluation. Early detection may facilitate environmental health education, improved ventilation, cleaner cooking practices, safer stove use, reduction of indoor smoke exposure, and timely referral for medical assessment. Community-based environmental health education may also improve awareness of the relationship between indoor air pollution and respiratory health and encourage households to adopt safer practices. Conversely, inadequate assessment coverage, limited availability of air-quality monitoring equipment, financial constraints, low awareness, cultural practices, limited access to cleaner fuels, and weak environmental health services may reduce the effectiveness of household indoor air quality assessment. The study therefore expects accessible and systematic household indoor air quality assessment to contribute significantly to improved detection and prevention of respiratory health risks among rural households in Nigeria. The study is expected to contribute to the literature on household indoor air quality assessment, respiratory health risk detection, indoor air pollution, rural household health, environmental health, respiratory health, household energy use, public health, and preventive healthcare in Nigeria. The findings will provide useful information to the Federal Ministry of Health and Social Welfare, Federal Ministry of Environment, National Primary Health Care Development Agency, state ministries of health and environment, environmental health officers, primary healthcare centres, rural health workers, community health workers, development partners, and policymakers regarding strategies for reducing household indoor air pollution and associated respiratory health risks. The study will also provide evidence-based recommendations for strengthening household indoor air quality assessment programmes, improving access to cleaner cooking fuels and improved cookstoves, promoting adequate household ventilation, increasing community awareness of indoor air pollution, strengthening environmental health monitoring, improving access to respiratory healthcare services, and integrating household air-quality assessment into appropriate community-based environmental and public health programmes across Nigeria.

Keywords: Household indoor air quality assessment, respiratory health risk detection, rural households, indoor air pollution, household air quality, biomass fuel, respiratory health, environmental health, clean cooking, preventive healthcare, Nigeria, public health.