This set of six caches is insprired by the Captain Planet and the Planeteers TV of the the 1990s, that covered everyday pollution concerns. This particular cache is dedicated to Captain Pollution, the titular characters arch-nemisis.
This cache is in the middle of the other five cached (more or less) just like Captain Pollution would be when all the rings came together.
To find the cache you will need to do the following calculations.
S (U+J+A)° (C*G).((Y-X)²+N)'
E ((D*K)-(M-U))° (O-E).(((F²)-H)*I)'
Make sure you noted down the letters and their values from the lids of the othere caches in this series, as you will need it in order to find this final cache. If you have found the previous caches, and forgotten or lost the letters and values feel free to inbox me.
This is an excellent oppotunity to get out of the house, do some exploring, a little bit of a mini CITO event (should you find any trash, and even reminise about the show.