Face coverings are effective ways to stop the spread of the coronavirus, according to the Centers for Disease Control and Prevention. But a new study found that two popular options, the face shield and the N95 respirator mask that has one or two exhale ports or valves, still release infectious droplets into the air.

According to Study Finds, researchers at Florida Atlantic University used laser light to illuminate the flow of aerosols released when people coughed or sneezed. In a university news release, the scientists at FAU’s College of Engineering and Computer Science said they used a mannequin to simulate coughing and sneezing while wearing both types of face coverings.

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Their visualizations showed that a large number of potentially infectious droplets were able to escape from the exhale valve on N95s and around the edges of the face shields or visors.

Read more at NEWSMAX.