[Comment] Substantial health threats from polluting household fuels

Traditional solid fuels, such as coal and biomass, continue to be widely used to meet daily cooking energy needs, with particularly widespread consumption persisting in many low-income and middle-income countries (LMICs).1 Incomplete burning of these solid fuels yields various hazardous particles that pollute ambient and indoor air.2 Prolonged indoor exposure to household air pollution (HAP) substantially elevates the risk of developing severe respiratory and cardiovascular diseases, such as lung cancer, chronic obstructive pulmonary disease, and ischaemic heart disease.