What is the duration of forest exposure in each of the 5 studies regarding the immune system?

From the Research

Duration of Forest Exposure

• The duration of forest exposure in the studies regarding the immune system is as follows:
  • A 3-day/2-night trip to forest areas 1
  • No specific duration mentioned, but the study discusses the effects of forest environments on human health 2
  • A 2-hour exposure to a forest environment 3
  • No specific duration mentioned, but the study discusses the effects of forest therapy on neurological rehabilitation 4
  • This study does not involve forest exposure, but rather wildfire smoke exposure 5

Studies with Relevant Forest Exposure Durations

• The studies that involve forest exposure and discuss its effects on the immune system are:
  • 1: a 3-day/2-night trip to forest areas
  • 2: no specific duration mentioned
  • 3: a 2-hour exposure to a forest environment
  • 4: no specific duration mentioned

Studies without Relevant Forest Exposure Durations

• The study that does not involve forest exposure is:
  • 5: this study involves wildfire smoke exposure, not forest exposure