Tag Archive for: Weather

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COVID-19 spread increases when UV levels decrease

COVID-19 spread increases when UV levels decrease - کاهش اشعه ماوراء بنفش در محیط باعث افزایش انتشار کرونا می گردد

Seasonal changes in UV may alter the spread of COVID-19 but not as much as social distancing.

Natural variations in ultraviolet radiation influence the spread of COVID-19, but the influence is modest compared to preventive measures such as physical distancing, mask wearing, and quarantine, according to new research from Harvard University.

Analyzing daily COVID-19 and weather data from over 3,000 administrative regions in more than 170 countries, Proctor, together with co-authors Peter Huybers, also at Harvard University, Tamma Carleton and Kyle Meng from the University of California Santa Barbara and Jules Cornetet at France’s École Normale Supérieure Paris-Saclay, found that the spread of COVID-19 through a population tended to be lower in the weeks following higher UV exposure. Findings were published in the Proceedings of the National Academy of Sciences.

Release date: 15 December 2020
Source: Harvard John A. Paulson School of Engineering and Applied Sciences

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Evaporation Critical to Coronavirus Transmission as Weather Changes

Evaporation Critical to Coronavirus Transmission as Weather Changes - تاثیر آب و هوا در انتشار کرونا
As COVID-19 cases continue to rise worldwide, it is increasingly urgent to understand how climate impacts the continued spread of the coronavirus, particularly as winter virus infections are more common and countries in the northern hemisphere will soon see cooler temperatures.
In a paper in Physics of Fluids, by AIP Publishing, researchers studied the effects of relative humidity, environmental temperature, and wind speed on the respiratory cloud and virus viability. They found that a critical factor for the transmission of the infectious particles, which are immersed in respiratory clouds of saliva droplets, is evaporation.
Release date: 22 September 2020