Impact of partial fuel switch on household air pollutants in sub-Sahara Africa

Vianney Tumwesige, Gabriel Okello, Sean Semple, Joanne Smith

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Abstract

Over 700 million people in Sub-Saharan Africa depend on solid biomass fuel and use simple cookstoves in poorly ventilated kitchens, which results in high indoor concentrations of household air pollutants. Switching from biomass to biogas as a cooking fuel can reduce airborne emissions of fine particulate matter (PM2.5) and carbon monoxide (CO), but households often only partially convert to biogas, continuing to use solid biomass fuels for part of their daily cooking needs. There is little evidence of the benefits of partial switching to biogas. This study monitored real-time PM2.5 and CO concentrations in 35 households in Cameroon and Uganda where biogas and firewood (or charcoal) were used. The 24 hour mean PM2.5 concentrations in households that used: (1) firewood and charcoal; (2) both firewood (mean 54% cooking time) and biogas (mean 46% cooking time); and (3) only biogas, were 449 µg m-3, 173 µg m-3 and 18 µg m-3 respectively. The corresponding 24 hour mean CO concentrations were 14.2 ppm, 2.7 ppm and 0.5 ppm. Concentrations of both PM2.5 and CO were high and exceeded the World Health Organisation guidelines when firewood and charcoal were used. Partially switching to biogas reduced CO exposure to below the World Health Organisation guidelines, but PM2.5 concentrations were only below the 24 hour recommended limits when households fully converted to biogas fuel. These results indicate that partial switching from solid fuels to biogas is not sufficient and continues to produce concentrations of household air pollution that are likely to to harm the health of those exposed. Programmes introducing biogas should aim to ensure that household energy needs can be fully achieved using biogas with no requirement to continue using solid fuels.
Original languageEnglish
Pages (from-to)1021-1029
Number of pages9
JournalEnvironmental Pollution
Volume231
Issue numberPart 1
Early online date25 Sep 2017
DOIs
Publication statusPublished - Dec 2017

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Northern Africa
Air Pollutants
Biofuels
Biogas
Switches
Air
Carbon Monoxide
Carbon monoxide
Cooking
Charcoal
Biomass
Health
Guidelines
Cameroon
Kitchens
Uganda
Particulate Matter
Africa South of the Sahara
Air Pollution
Air pollution

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Impact of partial fuel switch on household air pollutants in sub-Sahara Africa. / Tumwesige, Vianney; Okello, Gabriel; Semple, Sean; Smith, Joanne.

In: Environmental Pollution, Vol. 231, No. Part 1, 12.2017, p. 1021-1029.

Research output: Contribution to journalArticle

Tumwesige, Vianney ; Okello, Gabriel ; Semple, Sean ; Smith, Joanne. / Impact of partial fuel switch on household air pollutants in sub-Sahara Africa. In: Environmental Pollution. 2017 ; Vol. 231, No. Part 1. pp. 1021-1029.
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abstract = "Over 700 million people in Sub-Saharan Africa depend on solid biomass fuel and use simple cookstoves in poorly ventilated kitchens, which results in high indoor concentrations of household air pollutants. Switching from biomass to biogas as a cooking fuel can reduce airborne emissions of fine particulate matter (PM2.5) and carbon monoxide (CO), but households often only partially convert to biogas, continuing to use solid biomass fuels for part of their daily cooking needs. There is little evidence of the benefits of partial switching to biogas. This study monitored real-time PM2.5 and CO concentrations in 35 households in Cameroon and Uganda where biogas and firewood (or charcoal) were used. The 24 hour mean PM2.5 concentrations in households that used: (1) firewood and charcoal; (2) both firewood (mean 54{\%} cooking time) and biogas (mean 46{\%} cooking time); and (3) only biogas, were 449 µg m-3, 173 µg m-3 and 18 µg m-3 respectively. The corresponding 24 hour mean CO concentrations were 14.2 ppm, 2.7 ppm and 0.5 ppm. Concentrations of both PM2.5 and CO were high and exceeded the World Health Organisation guidelines when firewood and charcoal were used. Partially switching to biogas reduced CO exposure to below the World Health Organisation guidelines, but PM2.5 concentrations were only below the 24 hour recommended limits when households fully converted to biogas fuel. These results indicate that partial switching from solid fuels to biogas is not sufficient and continues to produce concentrations of household air pollution that are likely to to harm the health of those exposed. Programmes introducing biogas should aim to ensure that household energy needs can be fully achieved using biogas with no requirement to continue using solid fuels.",
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