What is the impact of different cooking methods (wood vs. charcoal) and locations (indoor vs. outdoor) on air pollution exposure, blood pressure, and peak expiratory flow in women in rural Malawi?
Personal PM2.5 Air Monitor (Int J Environ Res Public Health 2021, PMID 34300131) — six out of eight participants had PEFR below 80% of expected prior to exposure. The abstract for Personal PM2.5 Air Monitor states no limitations. Exposure to PM2.5 was substantially reduced by cooking outdoors with charcoal.
Source: Int J Environ Res Public Health 2021, PMID 34300131 ↗ · Research map · How Magellan grades evidence · evidence confidence: medium
Int J Environ Res Public Health · 2021 · PMID 34300131 · DOI 10.3390/ijerph18147680
Cooking outdoors with charcoal significantly reduces exposure to PM2.5 compared to cooking indoors with wood in rural Malawi, potentially mitigating respiratory symptoms.
The question
What is the impact of different cooking methods (wood vs. charcoal) and locations (indoor vs. outdoor) on air pollution exposure, blood pressure, and peak expiratory flow in women in rural Malawi?
What they tested
The study implicitly hypothesizes that cooking with wood, especially indoors, will lead to higher PM2.5 exposure and potentially negative health outcomes compared to cooking with charcoal or outdoors.
How they did it
The study used static and personal PM2.5 measurements with a miniature monitor (RTI MicroPEM) to characterize exposure among women cooking with wood and charcoal indoors and outdoors in rural Malawi. Blood pressure and peak expiratory flow rate (PEFR) were also measured.
What they found
Mean PM2.5 concentrations 1m from cookstoves were 1338 µg/m3 for wood and 31 µg/m3 for charcoal. Mean personal PM2.5 exposures were 706 µg/m3 for wood and 94 µg/m3 for charcoal. Personal indoor PM2.5 exposures were 3.3 times greater than outdoor for wood and 1.7 times greater for charcoal. Six out of eight participants had PEFR below 80% of expected prior to exposure. Reductions in PEFR were observed for participants cooking with wood indoors. Five out of eight participants reported breathing difficulties, coughing, and eye irritation when cooking with wood, with less severe symptoms for charcoal.
| Wood (1m from stove) | 1338 | |
|---|---|---|
| Charcoal (1m from stove) | 31 | |
| Wood (Personal Exposure) | 706 | |
| Charcoal (Personal Exposure) | 94 |
Mean PM2.5 concentrations (µg/m3) observed at 1m from cookstoves and as personal exposures during cooking with wood and charcoal.
What it means
Exposure to PM2.5 was substantially reduced by cooking outdoors with charcoal. Simple interventions like cooking outside and minimizing time near stoves could reduce risks of respiratory and cardiovascular diseases.
Limitations
The study involved a small number of participants (eight women) and did not explicitly state the duration of the exposure measurements or the follow-up period for health outcomes. It also noted that both wood and charcoal have negative environmental and health impacts.
The paper at a glance
| Title | Exposure to Air Pollution in Rural Malawi: Impact of Cooking Methods on Blood Pressure and Peak Expiratory Flow. |
|---|---|
| Journal | Int J Environ Res Public Health |
| Year | 2021 |
| PMID | 34300131 ↗ |
| DOI | 10.3390/ijerph18147680 ↗ |
| Topic | Environment, air, water & exposures |
Read the source: PubMed record (authors, abstract, full citation) ↗ · Publisher via doi.org ↗
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Personal PM2.5 Air Monitor
Long-term exposure to PM2.5 is one of the most consistently documented environmental risk factors for human disease and premature death. Large cohorts and meta-analyses link higher PM2.5 to increased all-cause and cardiovascular mortality — about 16% and 28% higher per 10 µg/m³ in the Harvard Six Cities extended…
PM2.5 refers to fine particulate matter, airborne particles with an aerodynamic diameter of 2.5…
Research describes the compound or intervention studied. It is not a claim about any specific product.
Molecules & mechanisms in this paper
Each of these is named in the paper’s own words above. Open the monograph for the full mechanism and its other citations.
Cite this page
These citations point at this summary. To cite the original paper with its full author list, use the PubMed record or doi.org.
Magellan Longevity. (2026). What is the impact of different cooking methods (wood vs. charcoal) and locations (indoor vs. outdoor) on air pollution exposure, blood pressure, and peak expiratory flow in women in rural Malawi? [Plain-English summary of Int J Environ Res Public Health 2021, PMID 34300131, DOI 10.3390/ijerph18147680]. Magellan Longevity. https://magellanlongevity.com/study/s189.html@misc{magellan_s189,
title = {What is the impact of different cooking methods (wood vs. charcoal) and locations (indoor vs. outdoor) on air pollution exposure, blood pressure, and peak expiratory flow in women in rural Malawi?},
author = {{Magellan Longevity}},
year = {2026},
howpublished = {\url{https://magellanlongevity.com/study/s189.html}},
note = {Plain-English summary of PubMed PMID 34300131; DOI 10.3390/ijerph18147680; Int J Environ Res Public Health 2021. Reviewed by Gabriel Radu, DO},
urldate = {2026-08-11}
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