Kitchen Characteristics and Practices Associated with Increased PM_2.5 Concentration Levels in Zimbabwean Rural...

Area of Science:

• Environmental Health
• Public Health
• Respiratory Medicine

Background:

• Household air pollution (HAP) from biomass fuels is a major global contributor to cardio-respiratory diseases and mortality.
• Particulate matter (PM), especially PM2.5, is a key indicator of HAP and indoor air quality.
• Understanding factors influencing indoor PM2.5 is crucial for targeted interventions.

Purpose of the Study:

• To identify household factors associated with increased PM2.5 levels in rural Zimbabwean kitchens.
• To provide data guiding efforts to reduce HAP in resource-limited settings.

Main Methods:

• Cross-sectional study of 148 rural Zimbabwean households using solid fuels.
• Indoor walk-through surveys and interviewer-administered questionnaires for kitchen characteristics and practices.
• 24-hour PM2.5 sampling using Airmetrics miniVol Sampler.
• Multiple linear regression analysis to identify predictors of PM2.5 concentration.

Main Results:

• Measured PM2.5 levels ranged from 1.35 to 1940 μg/m³.
• Traditional kitchens had significantly higher median PM2.5 (291.7 μg/m³) compared to townhouse types (1.35 μg/m³).
• Use of mixed biomass fuels, indoor cooking, and visible smoke deposits were significantly associated with higher PM2.5 levels (p < 0.001, p = 0.012, p = 0.044, respectively).
• Kitchen type, fuel type, cooking location, and smoke deposits were significant predictors of PM2.5.

Conclusions:

• PM2.5 concentrations in rural Zimbabwean kitchens exceeded WHO recommended limits.
• Kitchen design, fuel choices, and cooking practices are critical determinants of indoor air pollution.
• Interventions should address these factors, especially where cleaner fuel alternatives are not immediately feasible.