Lower Humidity Increases the Risk of COVID-19 Transmission

A new study from the University of Sydney, Australia, confirms that lower humidity is associated with a higher number of COVID-19 cases in the community.Lower Humidity Increases the Risk of COVID-19 Transmission

The research was led by Professor Michael Ward, an epidemiologist in the Sydney School of Veterinary Science at the University of Sydney. The team included two researchers from Fudan University School of Public Health in Shanghai, China. It is the second peer-reviewed study of a relationship between weather conditions and COVID-19 in Australia.

Lower humidity in other words can be defined as “dryer air.” The study says that for a 1% decrease in relative humidity, COVID-19 cases might increase by 7-8%.

The researchers explain: “When the humidity is lower, the air is drier and it makes the aerosols smaller. When you sneeze and cough those smaller infectious aerosols can stay suspended in the air for longer. That increases the exposure for other people.”

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