Cooking is the most basic daily use of energy, yet about 2 billion people, a quarter of humanity, still prepare most of their meals over open fires or simple stoves burning wood, charcoal, animal dung, crop waste, coal or kerosene. The smoke stays inside homes and is linked to pneumonia, heart disease, stroke, chronic lung disease and lung cancer. WHO estimates that household air pollution caused about 2.9 million deaths in 2021, including more than 309,000 children under five. Collecting fuel and tending smoky fires also takes hours of unpaid time, most of it from women and girls. This page covers the household cooking gap itself; access to electricity and outdoor air quality are covered on separate pages.
Since 2010 the number of people without clean cooking has fallen by about a billion, driven mainly by progress in India, China and Indonesia. Africa has gone the other way: population growth outpaces new connections, about 970 million people in sub-Saharan Africa lacked clean cooking in 2024, and the figure may pass 1 billion by 2027. Most of the people still cooking with polluting fuels live in rural areas, where fuel delivery is harder and wood can be gathered for free. Even households that buy a gas stove often fall back on firewood when a refill is too expensive, and fuel price shocks, such as the jump in LPG prices in 2026, put recent gains at risk.
What counts as clean cooking
Progress is tracked through SDG indicator 7.1.2, the share of the population relying primarily on clean fuels and technologies for cooking. It is estimated mainly from household surveys and published by the custodian agencies, including WHO, in the annual Tracking SDG 7 report.
Clean at the point of use
WHO counts solar, electricity, biogas, LPG, natural gas and alcohol fuels such as ethanol as clean, because they emit little smoke where food is cooked. Biomass stoves count only if they meet the emission targets in WHO's indoor air quality guidelines; most so-called improved wood and charcoal stoves do not.
Kerosene and solid fuels are polluting
Wood, charcoal, crop waste, dung and coal are classed as polluting, and so is kerosene, even though it is a liquid fuel. Kerosene is also a common cause of burns and of accidental poisoning in children.
Main fuel only
Surveys record the fuel a household uses most for cooking. Families that use a gas or electric stove alongside an open fire, a common practice known as stacking, can therefore be counted as having clean cooking while still breathing smoke.
Health effects are modelled
Deaths are estimated by combining exposure, population and disease data with risk curves from health studies. Results differ by method: WHO estimates 2.9 million deaths from household air pollution in 2021, while the IEA cites about 2.5 million deaths a year linked to cooking with traditional biomass.