BACKGROUND: Unprocessed biomass fuel is the primary source of indoor air pollution (IAP) in developing countries. The use of biomass fuel has been linked with @entity1729 . This study assesses sources of variations associated with the level of indoor @entity7459 ( @entity6836 ). MATERIALS AND METHODS: This study examines household factors affecting the level of indoor pollution by measuring @entity6836 . Repeated measurements of @entity6836 were made using a passive diffusive sampler. A Saltzman colorimetric method using a spectrometer calibrated at 540 nm was employed to analyze the mass of @entity6836 on the collection filter that was then subjected to a mass transfer equation to calculate the level of @entity6836 for the 24 hours of sampling duration. Structured questionnaire was used to collect data on fuel use characteristics. Data entry and cleaning was done in EPI INFO version 6.04, while data was analyzed using SPSS version 15.0. Analysis of variance, multiple linear regression and linear mixed model were used to isolate determining factors contributing to the variation of @entity6836 concentration. RESULTS: A total of 17,215 air samples were fully analyzed during the study period. Wood and crop were principal source of household energy. Biomass fuel characteristics were strongly related to indoor @entity6836 concentration in one-way analysis of variance. There was variation in repeated measurements of indoor @entity6836 over time. In a linear mixed model regression analysis, highland setting, wet season, cooking, use of fire events at least twice a day, frequency of cooked food items, and interaction between ecology and season were predictors of indoor @entity6836 concentration. The volume of the housing unit and the presence of kitchen showed little relevance in the level of @entity6836 concentration. CONCLUSION: Agro-ecology, season, purpose of fire events, frequency of fire activities, frequency of cooking and physical conditions of housing are predictors of @entity6836 concentration. Improved kitchen conditions and ventilation are highly recommended.

Sources of variation for indoor XXXX in rural residences of Ethiopia.

@entity7459 :: ('MESH:D009585', 'Chemical') :: ['nitrogen dioxide'] @entity6836 :: ('CHEBI:29785', 'Chemical') :: ['NO2'] @entity1729 :: ('MESH:D012141', 'Disease') :: ['acute respiratory infections']
@entity7459 :: (MESH:D009585,Chemical) :: ['nitrogen dioxide']
