Hand hygiene with hand sanitizer versus handwashing: what are the planetary health consequences?

Environ Sci Pollut Res Int

Department of Paediatric Dentistry, UCL Eastman Dental Institute, UCL, Gower Street, London, WC1E 6BT, UK.

Published: July 2022

AI Article Synopsis

  • The World Health Organization (WHO) and NHS England advocate for hand washing and hand sanitizer use to reduce disease transmission, particularly COVID-19, without fully assessing the environmental impact of these methods.
  • A life cycle assessment (LCA) in the UK found that isopropanol-based hand sanitizer had the lowest environmental impact among the hand hygiene options studied, producing less CO2 compared to ethanol-based sanitizer and various handwashing methods.
  • While isopropanol hand sanitizer is better for planetary health, all hand hygiene practices have environmental costs, emphasizing the need for further research and consideration of environmental impact in public health campaigns.

Article Abstract

In order to reduce the transmission of pathogens, and COVID-19, WHO and NHS England recommend hand washing (HW) and/or the use of hand sanitizer (HS). The planetary health consequences of these different methods of hand hygiene have not been quantified. A comparative life cycle assessment (LCA) was carried out to compare the environmental impact of the UK population practising increased levels of hand hygiene during the COVID-19 pandemic for 1 year. Washing hands with soap and water was compared to using hand sanitizer (both ethanol and isopropanol based sanitizers were studied). The isopropanol-based HS had the lowest environmental impact in 14 out of the 16 impact categories used in this study. For climate change, hand hygiene using isopropanol HS produced the equivalent of 1060 million kg CO, compared to 1460 million for ethanol HS, 2300 million for bar soap HW, and 4240 million for liquid soap HW. For both the ethanol and isopropanol HS, the active ingredient was the greatest overall contributing factor to the environmental impact (83.24% and 68.68% respectively). For HW with liquid soap and bar soap, there were additional contributing factors other than the soap itself: for example tap water use (28.12% and 48.68% respectively) and the laundering of a hand towel to dry the hands (10.17% and 17.92% respectively). All forms of hand hygiene have an environmental cost, and this needs to be weighed up against the health benefits of preventing disease transmission. When comparing hand sanitizers to handwashing with soap and water, this study found that using isopropanol based hand sanitizer is better for planetary health. However, no method of hand hygiene was ideal; isopropanol had a greater fossil fuel resource use than ethanol based hand sanitizer. More research is needed to find hand hygiene sources which do not diminish planetary health, and environmental impact is a consideration for public health campaigns around hand hygiene.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8865176PMC
http://dx.doi.org/10.1007/s11356-022-18918-4DOI Listing

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