Metric — Household Air Pollution Reduction
The measured decline in indoor PM2.5 and carbon monoxide exposure after a cleaner-cooking intervention.
SDG 3 Good Health & Well-beingSDG 7 Affordable & Clean EnergyWhat is it?
This metric tracks the change in personal or kitchen exposure to fine particulate matter (PM2.5) and carbon monoxide before and after adopting a cleaner stove or fuel.
Why does it matter?
Because health benefits follow exposure, not device labels, measured exposure reduction is the most honest proxy for whether an intervention is actually working.
How does it work?
Personal or kitchen monitors record pollutant concentrations over time; the difference against a baseline (against WHO targets) indicates the real-world reduction.
Who benefits?
Program evaluators, funders, and households benefit from a measurable signal that distinguishes effective interventions from ones that only look clean on paper.
Who may be disadvantaged?
Measurement is costly and technical, so programs serving the poorest may lack it — and averages can hide households that saw no improvement due to stove stacking.
What evidence exists?
Studies repeatedly find that many biomass “improved” stoves reduce PM2.5 far less than clean fuels, often still leaving exposure well above WHO guideline levels.
What tradeoffs exist?
Direct exposure monitoring is the gold standard but expensive; cheaper proxies (fuel use, surveys) are affordable but less reliable indicators of health impact.
Common misconceptions
A large percentage reduction can still leave air unhealthy if the baseline was extreme — the absolute level relative to WHO guidelines matters, not just the drop.
What you can do next
Use this metric to critically assess claims made for improved cookstoves.