Disgusting! Those "poor" old people having to inhale that "stuff".

Sorry - cannot help by identifing those critters. Here´s hoping someone else will be able to.
Good idea to report your findings and pics to some local newspapers - or Microbiological Dept. in a University or hospital ... they may be able to help researching and hopefully get some cleaning up done.
You will be doing a lot of old folks a great service!