Inhalers are the primary treatment modality for asthma and chronic obstructive pulmonary disease (COPD). Metered-dose inhalers contain hydrofluoroalkane propellants that contribute to substantial greenhouse gas emissions. The US federal government is facilitating a phasedown of hydrofluorocarbons over the next decade under international treaty obligations, yet current understanding of the scope and trajectory of inhaler-related emissions in the US remains incomplete.
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