Stanford researchers found that gas stoves in US homes emit high levels of nitrogen dioxide (NO2), often meeting or exceeding outdoor air pollution levels. For millions of people, cooking on a gas stove raises NO2 concentrations above long-term safety limits. The highest NO2 values occur in smaller apartments, tenants and rural households. Nitrogen dioxide is a known noxious gas that can damage the lungs and worsen breathing difficulties. Research suggests that switching to cleaner cooking technologies could significantly reduce these health risks. This study highlights a hidden source of toxic indoor air that is often overlooked[5].