Pedantically, not really -- it shows Bangladesh as #1 on that list, and Bangladesh is the "most polluted".

Pakistan is #2 and the "second most polluted" -- so extending that, USA is 84th on that list and hence the "84th most polluted", with country #106 being Puerto Rico, which is the "106th most polluted", and therefore the least polluted as per that list. So if you must reframe it as "least polluted", then USA is the 23rd least polluted on that list.

This is an incredibly misleading way to talk about this.

First, there are ~200 countries, not 106. Second, Puerto Rico IS the USA. Third, "84th most polluted" out of a list of 106, is just a weird way to talk. It's like saying the valedictorian of a class of 100 is the 100th most underachieving student.