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2022.1 CCE results release: Thursday 4 August 2022.
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Greening up: Environmental sustainability in general practice
Inhaled therapies are necessary components of treating asthma and chronic obstructive pulmonary disease, but their contribution to greenhouse gas emissions, and hence global warming, is clear. Some use propellants 1300–3350 times more potent as greenhouses gases than carbon dioxide. (25) The gas in a typical salbutamol pressurised metered‑dose inhaler (pMDI) causes about as much global warming as the tailpipe exhaust from a car driven for 300 km. The three main types of inhalers are:
Spiromax and Zonda devices
For all these device types, the carbon footprint can be calculated throughout the life cycle of the product, including raw materials, production, transport, use and waste disposal. (11) pMDIs rely on the driving force of propellants to atomise droplets containing drugs for deposition in the lungs. All inhalers have some environmental impact in their manufacture, transport, use and disposal, but the hydrofluorocarbon propellants used in pMDIs are such potent greenhouse gases that they are responsible for many times the carbon footprint of the rest of the device. (11) Hence, DPIs and SMIs have much smaller carbon footprints than pMDIs.
pMDIs with spacers are the preferred inhalers for young children (especially below the age of six years) and for people with severely limited inspiratory capacity. For most people, though, switching from a pMDI to a DPI can greatly reduce the carbon footprint without loss of asthma control. (12)
The gas in a typical salbutamol pMDI causes about as much global warming as the tailpipe exhaust from a car driven for 300 km.
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