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flag U.S. asthma inhalers, mostly metered-dose types, emit climate-warming pollutants equivalent to half a million cars yearly, with emissions rising 24% since 2014.

flag Metered-dose inhalers, widely used for asthma, are a major source of climate pollution due to their hydrofluoroalkane (HFA) propellants, which have a global warming potential thousands of times greater than CO2. flag A new study finds U.S. inhaler use generated 24.9 million metric tons of CO2 equivalent annually—equivalent to half a million cars—rising 24% from 2014 to 2024, with MDIs responsible for 98% of emissions. flag Alternatives like dry-powder inhalers reduce emissions by over 68% and are already being adopted by systems like the VA, though access remains limited due to patient suitability, cost, and insurance barriers. flag Experts urge expanding greener options to cut healthcare’s carbon footprint without compromising care.

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