PA resident here...
PA might be the most wishy-washy, non-transparent state there is when it comes to quarantine and travel restrictions.
The state publishes every Fridaya list of states that it recomends you quarantine if visited. No requirement because (insert favorite theory here). Of course, PA doesn't state on their website the official criteria that lands a state on the quarantine list either. Some news outlets made reference to the criteria a few months back, but based on current case numbers the article probably isn't accurate now.
From
Lehigh Valley Live (8/7/20):
States fall under the travel advisory if testing shows more than 100 new cases per 100,000 residents or a positive rate of 10% or greater over the last seven days, according to the Pennsylvania Department of Health.
100 cases per 100k over 7 days = about 14.29 per 100k a day
Data below (7-day average) from covidactnow.org
PA: 17.2 cases/day per 100k, 6.3% positive rate
FL (on quarantine list): 17.5, 6.5%
NJ (not on quarantine list): 17.0, 5.4%
OH (not on quarantine list): 24.3, 6.0%
NC (on quarantine list): 22.3, 6.9%
CT (not on quarantine list): 20.7, 4.9%
I guess I didn't actually answer the question