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Delta Variant’s Outdoor Transmission Is Still Unclear. Here’s How Philly Experts Are Thinking About COVID-19 Risk.

The Philadelphia Inquirer

August 2, 2021

Charles Haas, PhD, LD Betz professor of Environmental Engineering in the College of Engineering, was quoted in an Aug. 2 Philadelphia Inquirer story about the risk of spreading the COVID-19 Delta variant outdoors.
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