Abstract
A method is proposed to measure emissions of air pollutants from unvented biomass-burning cookstoves and to incorporate a measure of these emissions in the existing way of rating cookstoves by thermal efficiency. Emission factors for the three metal stoves tested burning Acacia nilotica were found to range between 13 and 68 g kg −1 for carbon monoxide and between 1·1 and 3·9 g kg −1 for total suspended particulates and to increase with increasing thermal efficiency both within a stove and across stoves. Emissions for a uniform standard task — the proposed performance index — were, however, lower for total suspended particulates for the more efficient stoves but higher for CO, indicating that the increases in efficiency were not able to offset the greatly increased CO emission factors.
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