Fresh air definitely has a positive effect on mood. There are a number of explanations why this occurs, and researchers from the University of Queensland have one: freshly cut grass and green leaves release at least five chemicals that contain stress-relieving properties.
If you're feeling tense and a walk in the park is out of the question, inhaling the scent of lemon, mango or lavender may also help reduce stress levels, reports a Japanese study.
Did you know? Your sense of smell is incredibly sophisticated? Researchers have calculated that we are able to differentiate between an astonishing 10,000 aromas.