Experts warn that common inhalers release potent greenhouse gases into the atmosphere.

A new study led by researchers at UCLA and Harvard has found that common inhalers emit greenhouse gases with a climate impact equivalent to more than 500,000 cars’ annual emissions. The team analyzed inhaler use in the U.S. over a decade—tracking propellant emissions from metered-dose inhalers used to treat asthma and COPD—and discovered the carbon footprint is far larger than previously estimated. While inhalers remain vital for respiratory health, the findings underscore a hidden environmental cost and a growing call for greener alternatives.








