Gas cookstoves and unflued gas heaters are a significant contributor to poor indoor air quality. Open gas flames produce a range of hazardous emissions including particulate matter, volatile organic compounds (VOCs) and nitrogen oxides (Lebel et al. 2022). Inhalation of these emissions is hazardous to health and people with asthma are particularly susceptible (Lin et al. 2013). The best strategy to minimise the health risks associated with exposure to emissions from open gas flames is to remove the source or, if that is not feasible, installing exposure reductions measures. For example, replacing gas stoves with electric cooktops and ensuring that gas heaters have an appropriate flue. Exposure to emissions from gas stoves can be reduced with an appropriate rangehood or exhaust fan. As a last resort opening a window nearby will reduce the concentration of gaseous emissions.