They measured each states’ gross-ness based on a few things. The main part of the study was based on actual scientific factors For one, they measured the air quality in each state. Then, they went on to measure the percentage of trash that is in each landfill in the state. For this they found the EPA’s data. Then, they took a look at how illnesses, like the flu, spread statewide. I mean, sneezing, coughing, and spreading illness is pretty dang gross.
They then looked at google metrics for popular searches in each state and the yuckiness of those searches. Data less science-y and more opinion-based. But certain cultural things about different states could be considered, not great, I guess.
The study yielded results for all 50 states and included a nice color-coded map of which states were a bit more…unsavory. The top 5 states are all in their slots for their own icky quirks. It was quite a shock to learn that Pennsylvania is on this list.