Welcome to Phoenix Rising!
Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of and finding treatments for complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia (FM), long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.
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I haven't measured my NK cells, but I live in a forest, and hike regularly in a forest ... and haven't noticed any benefits I can attribute to that. I'm sure it's healthier than sitting in a room, or even walking in a smoggy city, but it hasn't affected my ME noticeably.
Do you think it's possible that living in the forest has helped keep your CFS mild-moderate being able to do things like hike?
Phytoncides, such as alpha-pinene and beta-pinene were detected in forest air, but almost not in city air.