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HFA inhalers, used for asthma and COPD, cause major U.S. climate pollution; low-emission alternatives exist but are often inaccessible.
Metered-dose inhalers, widely used for asthma and COPD, are a major source of climate pollution in the U.S., generating emissions equivalent to over half a million cars annually due to their hydrofluoroalkane (HFA) propellants.
A new study published in JAMA found these inhalers accounted for 98% of inhaler-related emissions from 2014 to 2024, totaling 24.9 million metric tons of CO2 equivalent.
Dry powder and soft mist inhalers, which produce no HFA emissions, are effective alternatives for most patients but face limited access in the U.S. due to cost, insurance coverage, and availability.
Experts urge policy and pricing reforms to expand access to lower-emission options without compromising patient care.
Los inhaladores de HFA, utilizados para el asma y la EPOC, causan una gran contaminación del clima en los Estados Unidos; existen alternativas de baja emisión, pero a menudo son inaccesibles.