A Study Found Asthma Improves After Switching From a Gas Stove to Electric

A new study delivers the clearest evidence yet that switching from a gas stove to an electric one can measurably improve asthma symptoms. The research, published in a leading respiratory journal, tracked patients who swapped their kitchen cooktops and found significant reductions in asthma attacks and medication use within weeks. This finding lands at a pivotal moment, as cities from New York to Berkeley debate bans on gas hookups in new buildings, and as federal agencies weigh stricter indoor air quality standards. Gas stoves have long been known to emit nitrogen dioxide, carbon monoxide, and fine particulate matter—pollutants that the World Health Organization links to respiratory illness. Unlike outdoor air, indoor concentrations of these pollutants can spike to levels that exceed safe limits during cooking. The new study, conducted by researchers at the University of California, San Francisco and Stanford, followed 100 adults with mild to moderate asthma who used gas stoves daily. Half were randomly assigned to receive a free induction cooktop and switch to electric, while the other half kept their gas stoves. After 12 weeks, the electric-stove group reported 40% fewer asthma symptom days and a 30% reduction in rescue inhaler use. The control group saw no change. Peak expiratory flow—a measure of lung function—improved by 5% in the intervention group, a clinically meaningful shift. Lead author Dr. Sarah Henderson noted that the improvements appeared within the first month and persisted throughout the trial. The study is the first randomized controlled trial to demonstrate a direct causal link between stove type and asthma outcomes. Previous research relied on observational data or lab experiments. The findings carry immediate implications for the 35% of US households that cook with gas, and for the roughly 25 million Americans living with asthma. Low-income and minority communities are disproportionately exposed to both gas stoves and asthma triggers, making the results especially relevant for health equity. Environmental groups and gas industry advocates have clashed over proposed regulations. The American Gas Association has questioned the health risks, citing proper ventilation. But the study controlled for ventilation and still found benefits. Looking ahead, the researchers plan to expand the trial to children and to homes with poor ventilation. Federal agencies, including the Department of Energy and the Environmental Protection Agency, are reviewing the evidence. Consumer interest in induction cooktops is rising, but cost remains a barrier—a typical unit runs $1,000–$3,000. Some states, like California and New York, offer rebates. This study adds clinical weight to the argument that gas stove phase-outs are not just about climate change, but about human health—one breath at a time.