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Delta variant’s outdoor transmission is still unclear. Here’s how Philly experts are thinking about COVID-19 risk.

Photos of maskless revelers at Lollapalooza, an outdoor music festival in Chicago, this weekend prompted concern about whether packed crowds might offer a feeding ground for the delta variant.

Attendees walk along South Columbus Drive during the first day of Lollapalooza in Grant Park on July 29 in Chicago.
Attendees walk along South Columbus Drive during the first day of Lollapalooza in Grant Park on July 29 in Chicago.Read moreArmando L. Sanchez / MCT